Upgrade billing

Towards the end of March I did an upgrade of my Vodacom contract. The phone I received had an out of box failure (OBF) and was sent in. After waiting for the phone for more than a week I decided to cancel the upgrade, at which point the salesman I spoke to said because it was an OBF I would be able to do.<br> <br> I followed up twice in order to confirm that the upgrade was cancelled and that my contract had been paid up. The salesman confirmed it both times I queried it.<br> <br> Yesterday I was debited for the upgrade. Vodacom, why are you debiting me for something I do not have? Please sort this out immediately.