Unresolved. ********** Contract upgrade

I am dumbstruck by the incompetence of Vodacom and its staff. My contract was due for an upgrade in June/July 2016. I made an enquiry for an upgrade but did not sign up for that, instead I informed Vodacom that I want the contract cancelled. Fast forward to August, I get a bill for an IPhone 6 and data of 1G. What a nightmare it has been to resolve this ********** transaction under my name!!! I have called, written emails, sent affidavits , walked in at Vodacom outlets to no avail. I get sent from pillar to post. I call only to be transferred from agent to the next, and the final one usually acknowledges the ********** activity and informs me that the matter is escalated. BUT never resolved. I have blocked the debit orders with the bank, but am concerned that this *****s my good credit record. It is now 2018, and I still get calls from Agents asking me when will I be making payments! Like really #Vodacom#