Billing Problems

I have three accounts with Telkom . Mobile fone, wifi moderm and a landline. I have been having billing issues with Telkom. In August they double debited my account in October my account was not debited and I had to make a manual payment to Telkom. Then I get a message from nu debt saying that my account has been handed over for non payment I don't know how this is possible because I have set up a debit order. The nudebt staff are of no help I spoke to 7 people today yesterday I spoke to someone and the promised to call me back and I have not received a call back to date. I am at a point where I want to move my accounts to another service provider because at the rate that Telkom is going I will be listed as a slow payer when its not my fault and I have setup a debit order. The another issue is that I opened a Telkom landline with ADSL two months ago and Telkom has not debited my account to date and once again I signed up for a debit order.