Worst service ever

I upgraded in March 2015 to a sony Ericsson M2 Aqua. Very happy with the phone and will still want the same phone back. But my drama started in May 2015. The phone shut down and in no possible manner could it be rebooted. The following is the amount and report of times my phone went in for repairs and came back with the following reason \ NO FAULT FOUND."Seriously!!! No one in their right minds would send in <br> a phone without a problem. Now Vodacom is staling to replace it.<br> Above phone Has been rebooked on service base"