payment not allocated to my account, line being cut off

I have a serious problem with mtn, i took a contract with them around may 2021, two month back i started to express problems, two month back when my debit order goes through and after 3 days money will be come back to my account, then i decided to make payment via eft to their bank account, i send all proof of payment but to my surprise only one payment is being allocated every 3 days my line is being cut off, i even took the matter to their complaints department but nothing is done, even now my line has being cut off, please be aware if ever they go to my credit bureau and update that my account is on arrears i m afraid i will take these matter further.