faulty tablet and bad service

i was called by Nevashin Naidoo who offered me a Vodacom tablet on contract for R109pm. I received the tablet on 6th Feb but found it to be faulty in the 1st 7 days, so on 9th Feb i called Vodacom to have it collected. its now the 25 march still nothing has happened. I call in to Vodacom have to listen to music for 30mins then they drop the call. this is really unacceptable from vodacom. i want the contract cancelled.