Adt Security
Account Resolution - 9 months delay and counting

I have been struggling to resolve a billing issue (I am charged for hardware - which was clearly an error made by the sales team). In order to close the deal with me they waived this additional cost associated with providing the services. Then after the completion of installation I received a bill of R4, 000.00 which I did not agreed to.
I need this billing error to disappear and not being harassed by the accounts department for payment.
My attempt to resolve this is 9 months old now.
What does the Consumer Protect Act say are my rights???