Bad service and no clear communication between departments

I have had an account with Telkom for over 3 years now. I recently signed for a new data contract and they debited me the wrong amount and my account was suspended. I finally paid the outstanding amount yet they are telling me it will take seven working days for it to be reconnected. Bare in mind, the incorrect debit was not my fault and now I have to wait longer so they can reconcile and confirm payments yet they say my payment shows on their system. Everytime I called I am being sent from pillar to post and I don't understand how confirming a payment should take so long. I tried cancelling my contract but the guy I was explaining the problem to just told me to pay the balance rather than pay the 1200 to cancel the contract