Equifax Credit Reporting Complaint

Equifax Credit reporting department,

Credit reporting company's investigation Problem with statement of dispute Oregon

I requested an investigation from the credit bureau twice for a mistake on a delinquency. My credit report states the account had been paid and closed on -/-/2014. However, it also states the account has been transferred to another office. When I contacted the company that I had the account with they state its has been paid in full and is closed. I have been disputing the issue for a couple years now. The credit bureau made a remark stating that the investigation has been completed and that I disagree with them. Yet no one can give me the information on this mysterious " office '' that now has my account which was already paid in full and closed. Please help, I dont know what else I can do. Fixing my credit is very important to me. Thank you