Bad Repair Service

I upgraded my contract phone a Cat B15 on 24/08/2014, witch was nice phone work well everything was good, Oct the phone started getting slow freezing up not doing anything, i was told to take it to our repair center in Witbank, on the 29th of Dec 2014, where they told me to get a bigger memory card that will help witch it didn't. I send it in for repairs on the 24/04/2015 to be repaired it came back a month later, doing exactly the same hanging and freezing up.. i send it back again on the 14/08/2014 for the same repair came back 2 weeks later, doing exactly the same, send it back again on the 18/09/2015, Middelburg didn't even send it away it was laying in the technicians draw for almost 3 not doing anything, when i went there for the 3rd time requiring about my phone they found it in the draw, nothing done to it. when they phoned me saying the phone was fixed i could come and collect it, i switched it on in the store and nothing happened, and they send it for repairs again!! out of 1 year of having it i maybe used it for 3 months..really what is the use then, and what is the use of sending it for repair if they can't fix it... I insit on a new phone..take your dummy i am done!!!