Bad service billing issues not resolved

On the the 25/98/17 I was debited R1200 from my account as telkom debited. I then called in to find out why is the amount debited from my account. A lady explained to me why as I was in arrears for a month and R400 will be dedibted in my account again on the month end of August. And then I'll be back to my normal rates. On the 17/09/17 I recived an debit amount of R1189.44 but it bounced as there was insufficient fun to sustain the debit. I then called a gentlemen named khona mphile which he explained to me that they (telkom)debits anytime if I owe them money and every unsuccessful debit order telkom charges me R200. Which that's why the amount increased. He failed to explain why cause from what I know only me back charges me for any debit order that doesn't go through and it's less than the amouth Mr Mphile said about the interests that telkom charges like it's a financial institute. He failed assist me and I asked him to pull the recording of the last talk I've spoken to the lady on the 25/08/17 and he failed to assist. Later during the day I called in and and spoke to Nthutuko ntuli and he failed to assist as I told him as well the same problem I have with the amours Telkom's are deducting from my account and I sent him the billing of what I beilieve I owe and sent all the relevant documents to sustain my complains. I asked him to send me the voice recording of the conversation I had with the lady and he failed to do so! I want this billing issue to be resolved or I will take this matter to the ombadsmen.