Verbatim transcript of a chat session with Naval. I was having internet connectivity problems. Naval says (s)he resolved them, and then did the standard upsell trick, in which (s)he lied. Then when I noticed the problems weren't resolved, (s)he lied again.
Summary
Lie #1: " you will get additional service at a cheaper cost."
The rep correctly showed my current service is 50m down and basic cable TV for $82 / mo. He said Comcast had an offer where I could get "additional service at a cheaper cost." The "cheaper cost" is $101.99 for first 12 months and then $126.99 from 13-24 months.
Lie #2: "Every thing is totally fine"
At the exact time Naval said "Every thing is totally fine," Comcast was having well-documented problems:
https://downdetector.com/status/comcast-xfinity/san-francisco
Lie #3 (probably): "You will also check this problem on our site also"
The "server upgradation" and service degradation is not listed.
Trancript
Naval: Roger,I have also checked your account and found that we have a great offer for you where you will get additional service at a cheaper cost.
Roger_: what is that?
Naval: I can see that currently you are paying around $82 .00 plus rental of devices and getting 50mbps speed
Roger_: that's correct, yes
Naval: And limited basic package for cable in which you are getting 10
Naval: channels
Naval: However, I have a good deal for you, In this package you will get 140+ Cable Channels and 105 mbps Internet Speed & Unlimited Nationwide Talk and Text.
Naval: Double Speed!!
Naval: 14 times channels!!
Naval: Sounds Good?
Roger_: "additional service at a cheaper cost." = what is the cost?
Naval: This package will cost you only $101.99 for first 12 months, after that it will cost you $126.99 from 13-24 months.
Roger_: how is that cheaper than $82?
Naval: In this you will get double speed and 14 times channel and unlimited text and talk.
Roger_: you said additional services at a cheaper cost.
Roger_: then you listed additional services at a higher cost.
Naval: We are so confident in our products and services that we would want you to try them - risk free. If you’re not satisfied and wish to cancel the services for any reason, you can do so in the first 30 days and get your money back.
Roger_: what you did above is called bait and switch and it's illegal in the US
Roger_: this is one of the reasons people hate Comcast so much.
Naval: Okay. I appreciate your decision.
Roger_: you just lied to me.
Naval: Your satisfaction is my priority. Is there anything else I can assist you with? I am more than glad to help you out further.
Roger_: 
Roger_: I am satisfied with the tech support, but I am not satisfied with being lied to.
Naval: Thank you.
Naval: It was a pleasure assisting and chatting with you today! Have a great day and thank you for choosing Comcast. If you have any further questions, please do not hesitate to give us a call at 1-877-870-4310 or visit us at www.comcast.net for technical support. We appreciate your business!
Roger_: you're funny.
Naval: I am glad to have assisted and get your concern fully resolved for today!
Naval: You have opened a window for Comcast Support and I don't want to miss an opportunity to support you. Are we still connected?
Naval: Roger, Is there anything else I can assist you with?
Roger_: my internet problems aren't resolved
Roger_: still happenin
Roger_: g
Roger_: lots of services are hanging, etc.
Naval: Let me check that out for you. Would you mind waiting for a couple of minutes while I do the research?
Roger_: sure
user Roger_ has left room
user Roger has entered room
Naval: Welcome Back!!
Naval: Roger, As I can check from here your account is totally fine and you are getting good services.
Naval: Please run a speedtest for us to ascertain the speed you are receiving at the moment and send me the result link once you're done. Here's the link : http://speedtest.comcast.net/
Roger_: starting speed test
Naval: Okay.
Roger_: haha
Roger_: "starting in 5900 seconds"
Roger_: that's an hour and a half
Naval: Please allow me a minute .
Roger_: normally I use speedtest.net but it's unreachable for me today
Roger_: I'll try this http://www.speakeasy.net/speedtest/
Roger_: I just ran the test
Roger_: http://imgur.com/eMiqGft
Naval: Roger, you are facing this issue because our system is upgrading.
Roger_: 8.80M down, 0.68 up
Roger_: I just did a tracert to amazonaws and it fails
Naval: Every thing is totally fine.
Roger_: Tracing route to amazonaws.com [207.171.166.22] [formatting garbled, thanks cmd.exe, lots of timeouts]
Roger_: how can you say everything is totally fine when I'm getting 8M down and traceroutes are not working
Naval: You will get the right speed once the upgradation procedure is finished.
Roger_: you're saying my entire set of problems is because you're upgrading something?
Naval: It is due to our server upgradation.
Naval: No worries.
Roger_: what kind of server? I'd like to know more about this.
Naval: Sure!!
Roger_: please don't tell me no worries. I work on the internet. That's how I make a living. I have deliverables. If my internet is not working, I cannot work. This is a big deal.
Naval: Roger, You will also check this problem on our site also.
Roger_: I checked before this chat and it said there were no issues.
Roger_: where is the status shown?
Naval: I am doing advanced trouble shooting steps from here.
user Roger_ has left room
user Roger has entered room
Naval: Please check now.
Naval: Please tell me the result.
Roger_: aha
Roger_: now we're talking
Roger_: ... maybe
Roger_: nope.
Roger_: no better.
Naval: Roger, Please provide me your reliable phone number.
Roger_: xxx xxx xxxx
Roger_: 20.96 down, 0.44 up
Naval: I am raising ticket for you.
Naval: Our senior technical team will call you on the number given by you.
Naval: Please note down your ticket number
Update
I spoke with another rep, Jose, who was great. Excerpts from our chat, mostly for the lulz:
Jose: May I know the issue that our rep lied to you?
Roger: (summary of the above)
Roger: I asked the price
Roger: "This package will cost you only $101.99 for first 12 months, after that it will cost you $126.99 from 13-24 months."
Roger: $101.99 is not actually cheaper than $91.96.
Jose: yes that is correct. Its simple math.
Then this unintentionally hilarious pearl:
Jose: On internet issue they can be corrected by our Internet dept.
Jose: We are cable troubleshooting dept so all of our tools here are for cable TV.
Jose: On broken promises those usually happens on Sales dept.Jose: Here on cable troubleshhoting we dont lie.
