West Asset Management has been harassing me over a disputed bill based on misrepresentation by Qwest Communications for DSL service and I notified them numerous times that the bill was not legitimate and that I had already filed complaints with the Washington Utilities Commission, the Washington State Attorney General's Office and the FCC and FTC regarding the original bill itself and told them not to call me again. They continued to call after I repeatedly told them not to ever call again. And interestingly enough when I returned their call on a phone with caller ID blocked they still could see my number so somehow they have been provided special access to that also, probably by Qwest.
They did however provide me with an address and phone number including a phone number to send a letter disputing the charge. They are as follows:
West Asset Management
7171 Mercy Road
Omaha, NE 68106
1-800-949-1385 and 1-866-512-8707
The number to fax letters of dispute: (402) 384-6649
Attention: OPS-West Asset Management
One final thing I learned from someone else is that if a collection agency calls you, tell them immediately that you are recording the conversation and you will find that either they have a big change of attitude or they refuse to talk to you if you are recording the call. That says a lot. And if you need to have a method of recording the calls do an online search using Google or Bing and there are free programs for your computer if you have a modem card.
Best wishes!