No Assistance from the complaints department

I had vehicle finance with MFC in 2017. I sold the vehicle in September 2017 and obviously the account was settled. My credit report says the account is still active with a balance of R155099 on it and that im paying R3578 as an installment every month. How is it possible that you guys did not close this account. This affects the credit i am able to get as it looks like i still owe you money. I emailed your complaints department on Tuesday the 28th and i received a response saying someone will call me in 24 hours. No call after 24 hours so i send another email on the 29th and up until now no one has bothered to assist me. Can someone please assist me.