UNREPAIRED BLACKBERRY Z3 HANDSET

A NEW BLACKBERRY Z3 BOUGHT IN DECEMBER 2014. THE HANDSET GAVE ME PROBLEMS IN A MONTH'S TIME.THE SIM SLOT WAS UNABLE TO RELEASE THE SIM CARD AUTOMATICALLY. LATER IN MARCH 2015 THE HANDSET FAILED TO RECOGNISE THE SIM CARD AND I WAS UNABLE TO CONNECT.I DID A SIM SWAP BUT IN VAIN. I TOOK THE HANDSET TO VODACARE MIMOSA IN BLOEM IN APRIL 2015 SINCE IT WAS STILL UNDER WARANTY. AFTER IT HAS BEEN ESCALATED TO THE ADVANCE REPAIR CENTRE THEY RESPONDED WITH A QUOTE OF PLUS MINUS R2900, WHICH IS EXACTLY THE SAME AMOUNT I BOUHT IT WITH. I ASKED WHY? I WAS TOLD THERE IS ACTIVE LIQUID DAMAGE IN THE MOTHERBOARD AND THE WARRANTY IS NULL AND VOID. THAT WAS DONE TELEPHONICALLY. I COMPLAINED TO THEM IN WRITING BUT IN VAIN. I WAS TOLD ANYTHING FROM EXPOSURE TO WATER, LITTLE RAIN DROPS, SWEAT OR BATHROOM STEAM CAN DAMAGE THE MOHERBOARD OF WHICH NONE OF THOSE APPLY TO ME. THE AMAZING PART IS THAT THE HANDSET HAS BEEN WITH THE BACK COVER AS WELL AS THE SCREEN PROTECTOR FROM THE DAY I BOUGHT IT. I CANT REALLY UNDERSTAND HOW ON EARTH COULD THE FAULTY SIDE SIM SLOT BE LINKED TO THE MOTHERBOARD. I FEEL THATS UNFAIR BUSINESS PRACTICE AND JUST A WAY OF ESCAPING RESPONSIBILITY. PLS HELP.