Disgruntled Loyal Customer

Bought a laptop from Vodacom last year, came home and found it faulty. Took it back and they had a look at it and told me there was nothing wrong with it. Took it to a registered IT consultant, and he confirmed that the laptops hard drive was busy packing up, and will stop working soon. The processor runs at 100% even when there no programs running. Lodged a complaint with customer care, and they said that they escalated it to higher management. We have been waiting for months and no assistance. I haven't used this laptop properly as it is useless. Paying R890.00 pm for a paper weight. I would like to have a new laptop or cancel the contract. Maybe they will contact me when i stop the debit order.