Contract dispute

I received a call from vodacom with the offer to upgrade my contract which I was paying R335 for 30gig including the handset, the offer was for 50 gig +30gig night data which was going to cost me R339. I accepted the upgrade and I was told I can cancell the upgrade within 14 days if I'm not happy. After 7 days I saw a billing for the month of September, it amounted to R609,it also had a 3G laptop which I did not order, I called them to cancel, the sent me an sms that the matter has been resolved, but on 1st of September R609 was deducted from my account,i also still don't have a laptop that I'm charged for. When I try to call them they take me from pillar to post. The number for contract in question is *** Selelo Alfred Mosikare