NO FEEDBACK NO PHONE

I booked in my phone at Richards Bay in the first week of December 2014 (Still under contract) for repairs as the phone keeps switching off when not connected to the charger. I received a msg to come collect the phone (Presumably fixed) only to find that the phone was never sent out of the store, phone was re-booked into the repair centre. It is now March 2015 and I have no feedback from MTN, is my phone repaired? I am without a phone for 4 months, a phone that I paid a total of R8376.00 over the past 2 years! Why have I not have any feedback on the whereabouts of my phone? Has the problem with the phone been fixed? has the phone even been sent to the repair centre this time? The store never answers their telephone: ***. I was told the first time that it would take 2 weeks at the repair centre, then the second time they booked it in I was told it would take 1 week as they will make a plan to fix the mistake of not sending it the first time. IT IS NOW 11 WEEKS LATER?!?!?! to date I have had no feedback on whats happening. I want my phone fixed and returned to me, I cannot wait half a year for something I already paid for.