Faulty laptop, 3 months on and still no word

I wrote previously that my dell inspiron laptop i got on a contract from malfunctioned onlya few months after getting from MTN. Well this is three months and counting and I still don't have the laptop. I asked for the contract to be cancelled because I can't get another laptop whilst this dead laptop is still there. My work is suffering terribly. I am tired at having to borrow from others when I got a laptop. Another thing, in November 2017, i will be expected to pay for a laptop which is not in my possession. The solution is simple. Cancel the contract or turn it into a data only contract becausr so far the benefit I am only getting is data. Meanwhile I need a laptop and I don't have one...thanks to a decision to sign up with MTN!