WORST REPAIRS EVER DONE

On the 17th February 2015 I handed my Sony Xperia Z1 in for repairs at Vodacom 4 U Cape gate after it stopped vibrariting completely. Finally after 3 weeks and 4 days I received my handset back on Friday 13th March 2015. To my dismay my cellphone can now vibrate but there is no service. even after charging the batery and keeping the sim inserted for hours nothing happened. There is also no sound on my phone when music is played. i did not have a problem with volume or sound when the phone went in. But on the 1st report from the engineer it states volume is to low. I did not ask them to look at the volume, the only problem I had was vibration. I took the phone back to Vodacom and called the repair centre. now I get feed back that they can not \REPLICATE"the problem. so I am now paying a monthly bill for a cellphone I can not use. this is the worst service I ever had. """