Complaint Review: Convergent Outsourcing

Yesterday, I received a letter from a place called Convergent Outsourcing. The claim is that I owe $8677.01 to LVNV Funding LLC and that I can clear this all up by paying $1301.55.  Problem here is that I do not have any knowledge of LVNV Funding LLC or the  proported "original creditor" Compucredit Aquisition. I called the number on the letter yesterday several times and was never able to talk to a real person. What should I do? This is not a debt I owe. I have a good credit rating and have never seen this name pop up on my report at any time. Thank you to anyone who can advise.