Telkom *****ing money from accounts

Apparently, no one cares about **************** so I guess this is my last shot. I paid my Telkom account in full on the 10th of May only to be debited on the 15th anyway. Obviously, I was not going to let Telkom simply take my money so I refused to let the debit order through. So... I end up getting an R202,70 fine for failing to make my payment. Even though any person with an IQ higher than 5 could see that the penalty is unwarranted, Telkom refuses to listen to my case and refuses to let the penalty go. Now they have tried two more times to take the money out of my account and impose another R202,70 fine each time. So at this point, I am sitting with a penalty of R600+ and no one is willing to do anything about it. I don't think it's fair that big companies just get to decide when and how much they want to take out of our accounts even when our accounts are paid in full. How do I even fight this? How do I get my money back? Or am I just supposed to roll over and let them suck my account dry.... I need help please