Thirteen Month Old Dispute UNRESOLVED

In 2019 I cancelled with Santam, They still debitted my account even thou i was not a member anymore, I logged a dispute with FNB and with santam, three months after Santam didnt get back to me I now have a missed payment on my credit score, I have been on the phone with Santam for two weeks and even emailed bureaudisputes@santam and no one is resolving my 13 Month old issue.