MTN Online with no way to return faulty goods. Months of struggling

I ordered a mobile data contract with a laptop through MTN Online. They delivered and everything worked well and I was happy. About 3 months ago the laptop would not turn on. I spent days trying to get hold of MTN online, but it would seem that there was no way to return the laptop for repair or replacement. Eventually the laptop switched on again, and we used it like that for about 3 months. A few weeks ago the laptop again would not turn on. I tried just leaving it overnight hoping it would come right again (pathetic for a brand new laptop - Mecer) I then started the process of trying to get MTN Online to collect the laptop, but everyone I speak to at MTN does not know what to do. Eventually someone said to take it to an MTN store. We went to MTN N1 City here in CPT and they said they cannot take the laptop, MTN Online needs to collect it. I am now back to square one. We are paying for a device we cannot use for months now. We either would need this contract cancelled in full and I will find a solution that works, otherwise they need to make right by me some way or another.