Incorrect billing

Telkom fibre line app**** for after almost 5 months of issues the line was installed The correct details were all sent through when the contract was app**** for the month of August I am billed R1126.22 For a R399.00 Fibre line which is capped Now I call telkom and they confirm there is billing for R202 .00 for a returned debit order and a fees of R4 for late payment but its telkom fault as the correct bank details were provided however they used the bank details from an account 5 years ago Now I am sitting with a difference in my bank account and this is an issue I need the money returned to my account immediately. and the debit order cancelled I will pay the account via the app monthly Thanks