You can sue them.

If Comcast is calling your cell phone (not landline) without your express consent, you can start a class action under the TCPA (Telephone Consumer Protection Act).

I am being represented in a TCPA case by the IHateTelemarketing attorneys:
http://ihatetelemarketers.com

Highly recommend speaking with them if you're willing to be a class rep.

Believe it or not, Bright House is even worse!
After getting their phone service with our Internet service, we were deluged with telemarketing calls, and were forced to add that number to the DNC list to stop the harassment, and block the calls that still kept coming in.
We only got their phone service since it was basically free, when bundled with their Internet service.
We only have Bright House since they have a monopoly on this territory, as all providers do.
They all have their own territories, where they are the only provider in that territory.  Their own little fiefdoms.
I had Comcast before, and would much rather have them than Bright House, even though they both suck.
They are just less bad...

turned off Comcast - received the call few days later

Comcast/Xfinity calling to confirm disconnect.  Took several seconds & a "beep" before some dude came on the line.

This number just called me but I did not answer because I did not know the number... However, after reading the messages on here I do believe that they are Comcast due to me cancelling their service earlier this morning. So they did not even wait 1 day!!
Terrible to say the least!

dropped comcast last night got call today.

This jives with my experience... I just cancelled Comcast as well and now I'm getting calls from this number up to 3 times a day.  Anyone  know how to ask them to stop calling?

I also dropped comcast last week ad am now getting daily calls.

Yep...me too.  I quit Comcast because of their bad practice of telling you that all your promotions will last for X amount of time, but then billing does not reflect the same.  Got tired of them increasing my rates outside of what they told me they'd do.  Funny...can't get anything in writing from these turkeys!    Now they're calling me 2-3 times per day...no message, and no one on the line.

Of all companies on earth, I DESPISE COMCAST THE WORST!!!! ( If it weren't for their employees having to lose their jobs), I wish this company would go bankrupt and drop into a great big sink hole!!

I also cancelled my comcast account a couple days ago and I have gotten 4 missed called from this number. Another reason why I HATE COMCAST!!!!

ComCRAP sucks. I dropped them because FiOS is better and now they are calling me daily.

Get lost ComCRAP!!

6 calls in one day.

Got about 1 call a day after canceling Comcast.  Finally called back and confirmed it is a 3rd party rep for comcast promotions.  Basically a ploy to have you actively call them.

Had them remove my number from their list without confirming and of the info the guy tries to ask you for (name, address, etc...)

3 calls in 2 days. I closed my Comcast account 3 days ago. I have answered two of the calls and there is no one on the line. No message from the third call.

I have gotten 5 calls over the last 3 days. I dropped Comcast about a week ago. Very annoying.

Yeah I got rid of Comcast too because and have gotten a couple of these calls in the last few days.

Interesting, I just dumped Comcast three days ago, and just got a call from this number, so sounds about right...pretty annoying

Second call, first on 09/25 (at 09:50 am), second a few minutes ago (09/27 at 5:45 pm).  We do not answer unknown numbers, and because whoever called didn't leave a message, the call must not have been important or was spoofed number and a scammer calling.

Comcast when I called back

Just dumped Comcast and started receiving calls the same day from this number selling Comcast service.

2 calls - 8:20 P.M. last night and 11:32 A.M. today - No message

4 calls over 2 days.  No message.

2 calls

I got calls from the same number two days in a row.  Don't know who they are.