Telkom charged me a penalty fee for owing me money!!!

After receiving no assistance from Telkom as promised so many times... I went to the bank and reversed the amount that should not have been debited in the first place as it meant that I had paid twice for the same invoice in December. Today I received my invoice from Telkom and to my surprise I have been charged R200+ for reversing the debit order. How am I being charged for doing something that Telkom failed to do in the first place, after asking on more than 1 occasion for them to reverse the debit order??? Further my account was not in arrears in any way or form, so is this even in line with consumer rights?? I'm fed up with your shoddy customer care and please don't tell me I will be contacted to resolve the matter because I am STILL waiting for someone to call me with regards to my initial issue with Telkom. I really cannot believe that I'm being charged for doing what Telkom failed to do in the first place!!!!!! I cannot wait for my contract to end!!!