Consolidate Debt Service

How I can play one on debt collections letter I tried to pay?
In 2003 I used a credit counciling service (Consolidated Credit) to clear an outstanding debt of approx. $ 8,000 to Bank of America. I set up an account with Accredited consolidated selling my account at Bank of America, had closed five monthes before. I assumed that the Bank of America remains the property of the debt because it had not received notice stating otherwise. I made payments on credit Colsolidated for several months with the total amount of approx. $ 2,600. At this point, I received a letter from a third company stating that they now owned the debt and not accept payment this service and now my debt was $ 8,000 plus interest and fees. At this point a lawyer advised me to ignore because I had made a good faith effort to pay the debt and my payments were rejected. Now it is four years later and another collection company has been contacted about it. In addition to sending a letter refuting the debt, what I can do?
Instead of entering a long answer, here are some links to free advice. Http: / / www.access.gpo.gov/uscode/title15/chapter41_subchapteriii_.html U.S. Code Title 15 Chpt 41 http://www.ftc.gov/bcp/conline/pubs/credit/crdright.shtm Consumer Credit Protection Credit and your consumer rights. This is probably just a junk collector, you can research here: http://www.budhibbs.com/am_worst_collection.htm Hope this helps.
Consumer Debt Service