New phone in for repairs more than what i've used!

Got a new Business Contract With Cell C. 3 Days of having the contract the phone (of which I only used it half a day as I was waiting for the sim to be activated) started giving me problems. They would not exchange it (as per contract stipulating 7 day return) they first have to send it in for repairs (takes 3 weeks). They called reps was there every second day for a month. sent it in for repairs which took 2 months. Got it back just to book it in again on the 10 August. I have called the repair center but they do not answer the phone. It is the 7th Dec and I still don't have my phone back. I am paying every month for a phone that I have not used for 2 weeks!! I am so sick of this bad service and am going to take matters further, and close our business contracts if I don't get a new phone for which I am paying for every month!! Our money is very important to you but not your service!! Do you think you can actually get hold of someone that can assist you? At the store they just pull up their shoulders and say its out of their hands! Pathetic!!