Telkom service is driving ne crazy

My name is Hannelie Schwarts. I have 2 mobile data lines with Telkom. For the past year I am.experiencing problems with their billing department. I pay my account via debitorder. The problem is that some months they just do not debit. Then I have to call them and do a EFT payment. Some months they debit double or not the correct amount......again I need to spend hours on the phone I spoke to my bank to enquire if the debit problem is from there side- we went a year back and it was clear the months they did not debit, was a Telkom fault as they did not put the debitorder in. My account is spotless and I never had any default. The problem is now that Telkom debit my account now through a third party ( because of the " default" and the third party only send the payments to Telkom 4- 7 workdays after the debit. Telkom however does not wait for proof of payment they just susbend my paid lines. This means I have to call their billing department,spend hours on the phone every freaking month so that they can escalete my payment. So for 4- 7 working days their is no internet. The ****le is with my child ****m from me and she is studying and need wifi. Every month Telkom promise me to fix the problem . Today-day 7 without internet I called again but this time to cancel my contract.....they can not cancel the contract becauese the line- the paid via debit order line is suspended. Basically Telkom is helding me hostage. I am fed-up and do not know how to proceed. This is going on for a year