Wrong billing of account

They deducted double payments from my account and did admit it was a mistake on their side the first consultant I spoke to said it is going to take long for the reversal on their side as I had other debit orders that had to go off the next day so after spending 2hours on the phone with telkom and never being able to solve it on their side the 4th consultant said it would be quickest to do the reversal at my bank. So I did reverse the 2nd payment that was charged incorrectly by telkom and paid fees for doing so. then this month on my account telkom charged me a reversal penalty on my account for something they could not fix in first place and for a mistake that they made I am furious cause once again for overcharging me my other debit orders can not go through and I had to reverse payment again cause I'm gonna pay other penalties again if my other debit orders cannot go through tommorow again cause they again charging me for something that should not have been added to my account in the first place I am so frustrated ? as I spend hours on the call Centre paying a fortune on airtime cause of the companies mistakes and they don't even have odassity to call you back when your phone cuts out.