Vodacom is giving me a bad credit rating on my credit score after going prepaid almost a year ago!

My account has been converted to prepaid in March 2021 however my account status has still not been updated and Vodacom is contributing to a bad credit rating on my credit score. I did a credit check on myself and found out Vodacom still had an outstanding amount on my account which I was not aware of as my number had been converted to prepaid and all payments had been brought up to date. I am requesting that my credit status be updated. I made payment and I am not going to make another payment to Vodacom. This will be my second payment made since my account has been converted. I have been on prepaid for almost a year. Can you please remove me from contract status to prepaid status.

I also have a reference number (***) that an investigation was launched but nothing came from it (shocker)