Billing Dispute... I am really fed-up!

Telkom Mobile is extremely frustrating!! Now you do not even deduct the full amount due. I paid it in via your Mobile Website because YOU ADVISED that it is faster that way!! Sent through the Proof of payment, only to have a debit order come of the next day!! This is extremely angering and has interrupted my service, now I am using my prepaid sim card when i actually have a contract sim but I cant use it because you do not want to reinstate my services even though i paid!!! Can someone assist here, its really angering, makes me think of even cancelling this contract!!