Extremely unhappy with fnb and their customer service

3 months ago I contacted FNB as I was trying to dispute a debit order. What proceeded from there has been endless fights with fnb over a Telkom debit order that's been allowed to go off my account. My contract has come to an end and the amount they are trying to debit is almost double the amount that my contract with them was signed for. I am at a point where I am fighting with Telkom with this but FNB isn't making it any easier for me as a client. I have had to contact the premier contact center numerous times to reverse unpaid debit amounts that I was charged whenever Telkom tried to debit my account. I even called the call center and was told that Telkom would be blocked from debiting my account for a fee of R25. I honestly don't know why I was charged when I pay R230 for bank fees every month, surely that amount should be included. Only for Telkom to try to debit my account again on the 25th of October and unpaid debit fees to be charged again. They actually managed to debit my account today even though I was told by fnb that they wouldn't be allowed to and 3 months later I'm fighting the same battles again. This is ridiculous. I don't see how it's legal that fnb can allow a provider to debit my account without my permission. When a mandate is granted, I allow my account to be debited by how can I not cancel that mandate if the service provider is trying to charge me more than the agreed amount. As a client, I am disappointed that I pay so much in bank fees; have opted to use FNB related providers for loans and even my car finance yet I AM FIGHTING OVER A DEBIT ORDER???... This cannot be the customer service that I am paying for. At this point, I am honestly ready to switch banks and save on bank fees that I can surely be using to pay for debit orders just being allowed to go off my account.