VODACOM -Paying for the IPhone whilst I don't have the phone

I ordered Iphone online last year Oct delivered by Ram courier service , after delivery I realized that the memory was not enough, they said I must return it, Ram collected the phone, later on I phoned vodacom more than 2 months to enquire about it, was transferred from one department to the other, Ram confirmed that the phone was delivered to Vodacom, I was so disappointed one of the consultants said to me they received the phone the upgrade was canceled, opted to go to vodacom outlet, I was so disappointed when I get there they said to me it is still active on their system they can't assist since it was done online, time wasted, calls and money. There was one of the consultants who was willing to assist making follow-up with me of which I appreciated and there was progress with my query confirmed that there is an indication that they received the phone will arrange for refund, to date I have not heard anything from vodacom I'm tied of explaining about something for more than han 3 months, everymonth they are deducting from my bank account