Damaged phone after repair by Service Centre

I sent my Sony Z3 Compact in for a ear piece repair on the 4 February 2016,, after a long wait I was told the phone is ready for collection , I went into the store to collect the phone just to find that my phone which I looked after like a diamond had scratch marks on it, chip marks on the front screen, and more concerning that the back panel was not secure and I could actually lift it up.<br> I took photo's of the issues, and requested that I get a new phone as replacement due to the sony being a water proof phone, the repair center did a water test on it. Thus, because the back panel was not secure water has entered the phone.<br> Today the 29 February 2016 I receive a email from MTN that they will not repair or replace the phone and I need to come and collect it.<br> The service I have received from MTN is terrible, not to mention that someone has damaged my phone which MTN doesn't want to take responsibility for.<br> <br> I have photos which prove that it did not have the scratch marks or the more concerning chip marks on the from and back panel and screen, and Not MTN doesn't want anything do to with the phone which they have damaged!<br> <br> Numerous emails and phone calls no help.