VERY POOR SERVICE AND COMMUNICATION FROM MTN

I have taken my Laptop to Mtn In September and I was told it would be sent to Repair centre to Sort out and will get it back within 7 working days from date of pick up from repair centre. I phoned on numerous occasions and the store has told me they did not get response from repair centre, I got a call in November from Kitchen saying that repair centre told them that the laptop is out of warranty and they cannot repair, however I have a letter wen I took my contract stating that the Notebook has a 2 year warranty, Kitchen fined again and he said they will send it back and I will have it within 7 working days, when I phoned them again they said that they only took it on the day before and I have to wait another 7 days, I said ok and it was done, when I went to pick up laptop with a new CD it was still not reading, kishen took it to a store next door to check if it work and they guy checked by connecting aub cable and it was picking up, however I came home and it refused to work. I called the repair centre n they advised they could not pick up any job card for the job, n it was not sent to them, I need a new laptop from MTN nd a response urgently by telephone.