I think comcast would only stoop that low only after so long of not paying. This collection company only calls my cell and never leaves a message. I think they are a bogus company with illegal actions.

Call and call and call. Fom Waldorg, MD. 240-210-7113 caller ID says
  Receivablespedf  ??  I don`t answer.

Let me solve the mystery for you guys.  After reading the onter posts and doing some quick research on this number.  It is a COLLECTION AGENCY. They are disguising there call by masking it to another number. I have not answered the call from this number because by rule i dont answer the phone unless its a number i recognize or the name on the caller id is something that i am familar with. RPM stands for Receivables Performance Management. Stick it to the man.. tell these people to play a rousing game of hide and go F*C@ yourself

http://www.receivablesperformance.com/

They have 2 offices one in Lynnwood WA and the other in Portland OR. On my phone comes up as Cellular Call

I read your post with great interest. These people have been driving me up a tree. How did you finally get rid of them?

go to www.budhibbs.com
Read dealing with Collectors 101..  

They also buy JUNK DEBT - legally uncollectable debt for pennies and then break FDCPA laws to collect what they are not entitled to.
They cannot provide debt validation - they falsify court documents if they do try to sue you.

it is important that you tread carefully and show up to court and dispute everything with these bottomfeeders.