Worst service ever, debited my account for no reason

My debit order went unpaid on 1st October amount of R866-33, I then made payment on 13 October amount of R819-70 and R51-33, Today the 19th October Telkom debits my account of R1686-03, which is clearly unacceptable, I then called Telkom today the 19th October at 16-04pm to query this but was told it's not reflecting on the system, I then asked to speak to the manager and was put on hold for few min he then came back to me and said manager is on another call, I then asked for the gentlemens name that I spoke to, he then said he will sms me the details, I haven't received any sms, this is pathetic service, the money debited is not acceptable as its not due, the money in my account was for my daily needs for the week, now I'm left with nothing, Very disappointed customer,