Charging R1084 p/m for cancelled services?

Called Vodacom to cancel contract IO270497 on 14th March. Reference given was Nyalleng (no reference or ticket number can be generated by Vodacom, really??) spoke to her at 14:02 and requested her to cancel a data contract which for the past few months monthly charges had shot up to R1084 per month even though the card was no longer in the Tablet even, it had been removed! Come end of April and I am still being charged R1084 p/m. Called on 4 May @ 11:05 (again only given reference of "Thando") and she advises she can see its cancelled but can also see another debit is going to go off end May!!! Puts me through the *** accounts, call eventually picked up and Im told this is customer services (even tho the teleprompt advised it was accounts and confirmed my account number over voice rec) she tries to put me through to accounts again and ive just spent 20 minutes holding! Why is Vodacom changing me for this cancelled service? Please pay me back my money and never debit my account again for this account. Why can you not even generate simple ticket numbers? Pathetic service for a long standing customer.