Contract still new and now cannot get the laptop repaired

I got a new laptop in the month of August this year and the laptop now had a line and part of the screen is not working.when I called Vodacom they told me to go any Vodacom store and they book it in for me for repairs I went today to Clearwater water mall and was told to phone Mercer to get them to come out.to my understanding I took the laptop contract from Vodacom and this is simply Vodacom makes this the customer problem I now go for nothing to the mall being given the runabout and left with a new laptop that does not work properly yet I still need to pay for this contract and get no service.i will definitely not be renewing my contract again as you guys only look at how you can get money out of me.