A possible scammer call.

Received a call today (05/16/2012 at 10:09 am CST) from a very rude man that goes by the name Victor Rameriz. Stated that he was a manager calling from CAB Asset Management in Maryland. He stated he was calling on behalf of his client PDL only after I insisted he tell me his clients name. He ask several questions. One being the last four digits of my ss#. He stated that it was $1,010.00 and he would give me a discount, what could I pay today? We went back and forth but he did not want me to say anything. I finally ask him his telephone number, but to no avail he gave me only the first three numbers 877 and would not give me the remaining numbers. I informed him if I can not get a telephone number we can no longer talk. He stated that I should act my age. I stated to him He should act his age being a manager if he was such he should know how to solve problems in a more professional manner. I told him that I dispute the validity of the debt and any portion thereof. He said he would list it as "I refuse to pay." I was about to tell him where to go, when he hung up. Can you tell me if this company exist, and whom I should speak with for a complaint? Thanks Mrs. B:(