Telkom mobile is messing up my credit record.

I opened a contract with telkom mobile. I was promised to be debited on my salary date however I have not been. Contacted call center and went to branch however they promise to assist me and nothing has changed. I receive letters stating my account is in arrears which is not my fault as I have money available every month for the debit order. I was told to make a cash payment which is inconvenient as I provided my bank details for the debit order. I am very upset that I am getting bad service and I will never recommend anyone to take a contract by telkom. It has been 3 months and no assistance was provided.