Work from my boss' house. Got a call from this number for him and took a message. The caller asked me to have him call 800-543-5788. It is a company called CMI Collections out of Carrolton, Texas. They apparently perform collections for Time Warner/Comcast

Collection agency on behalf of Comcast, the caller is extremely unfriendly .

I called that # back and they are with Comcast trying to collect on a bill that I refuse to pay! I had bad service with Comcrap for 8 months and yet continued to pay my bill. My remaining balance was to be 0'd out, but no...those a-holes sent me a bill for $107....I am NOT paying that [***].
The collect-a-[***] called both of my #'s and hung up each time. I called back and explained that I dont appreciate hangups and for her to identify herself.
She refused and asked for my last 4 digits of my social....I told her to [***] off.

They called my business line and asked for a particular person.  I could not understand the name and asked her to repeat the name and the called hung up the phone.  I called the number back and requested to remove my business number from their list.  Comcast (CMI) did not act very professional in my opinion.