Sony and MTN Lack of customer care. Disappointed

MTN has been my service provider since 2005. Thus far I have been relatively happy with their service. Last year around April I upgraded to a Sony Xperia Z3. I was very happy with my phone seeing as it was an excellent phone. At the beginning of the year my phone got wet and stopped work dispite it being proudly advertised as a waterproof phone. I took my phone in to the MTN branch in Tzaneen Lifestyle Centre in Jan/Feb of this year. They sent it away. After a few weeks I received a very confusing message that stated that my phone was beyond repair and I had to pay R380 to get my broken handset back. I must say I am VERY disappointed in MTN's lack of customer care and Sony's backing of their product quality! I was offered no alternative or way to get a new phone or maybe a pay-in to get a new phone. I was simply told my waterproof device I have had for less than 9 months was \beyond repair\" and I had to pay to get my broken device back! This saddens me greatly as I really thought MTN or Sony would care more for their customers. They inspected my phone and could see that I had not voided the casing or left any latches open when the phone got wet. No solution was offered. "