Bad customer service

I settled Foschini, many years ago however for the last 3 years or so, I have been getting the back and forth, I have sent the collections companies many proof of payments to show I settled the account in the same month they were selling my account, however 3 years later still no help or updates, or responses. Soon as I send my proof of payments the collection agencies, just never respond when I contact TFG they say there is nothing they can do, I need account update as well as ITC, will send proof of payments again for the millionth time if need be.