Hisense repair sucks

I bought a Hisense U988 March 2015, 2 months later the phone decides not to charge and NOT pick my USB mode up when i plug it in my PC, booked my phone in through Rectron which they send to Hisense, within 5 working days i recieved my phone FIXED, 3 weeks later my phone gave the same problem with my screen cracked this time, i booked it in with Rectron again, after phoning and fighting to know whats happening, Hisense contactes me giving me a quote of R1170, saying i tried opening the phone after they were the only ones touching my phone and they also said there was a water mark on my motherboard of the phone, funny enough all the people who bought the phones at Rectron had the same problems and Hisense gave them the same excuses not to fix thier phones, and the phones gave problems while still under harware warranty.