Afni, Inc. Debt Collection Complaint

Afni, Inc. Debt collection department,

Other (phone, health club, etc.) Cont'd attempts collect debt not owed Debt is not mine New York

This all started back in - 2014. A collection agency, - - -, reported to - and claimed I owed - from -. I have not had - service in several years. To ensure, I contacted - and verified my acct was closed in good standing and was never sent to collections. They also confirmed my information was not used to open any accounts after my account was closed, which would theoretically rule out identity theft. I submit a dispute with - and it gets removed almost immediately. Great! - months later, I got to apply for something and get denied. Check credit report and a new collection agency by the name of - has this so called debt now. I submit another dispute with TransUnion and after they went through their investigative process, they removed it as well because the Collection agency could not verify the debt. During the investigation, - could not verify the debt and sold of the debt to a new collection agency, AFNI INC. That new collection agency is now looking to collect on this false debt. I am sure after I submit letter of verification, they will attempt to sell it off again. My concern is that I will be in this loop for ever. - claims they can not do anything because every time it is sold to a new Collection agency, the acct numbers change. Is there anything I can do?