Contract not upgraded but the upgraded anyway and no device received.

My son's was due for an upgrade so popped into Game Cape Gate to see what specials were available. They said they would find out if i qualify an hour later still no answer and had been in the shop waiting, left and the following day got a call to say i do qualify for the special i was interested in. But I told her to cancel as I decided not to do it yet as he was not doing well in school and did not want to add to his distractions. She understood and then i saw i was billed for an upgrade went in complained said they would cancel.This was October 2017. December 2017 is paying for this upgrade that never happen told game to give me the phone as they not cancelling it. I have phoned vodacom numerous time always told it takes up to a month to cancel. Now i'm exhausted and feel like cancelling all my contracts.