Vodacom online aftersales service sucks

Ordered upgrade phone on 8 February. At last after a huge struggle due to Vodacom not giving the 3rd party delivery details through to the courier company, at last received a faulty device on 18 February. Ordered a replacement device. Called FOUR times to make sure that this time they give he 3rd party delivery through, each of the 4 times they confirmed it was done. It was not. Phone returned by courier company to Vodacom on 11 March. Vodacom received it on 16 March. Was told I must redo the order. Yes, the order that I placed on 8 February. Decided that I've had it, I'm going to cancel and not upgrade after all. Was told that I cannot. So I've been billed for a faulty device that I cannot replace nor cancel and seems to be stuck with a 3 year contract!