SA Cell World(Mall@reds) Bad service and Repairs

I booked my phone in for repairs on the LCD screen and back cover. Sony experia z3 Compact. i Could see that the coloring on the screen was not like it used to be, the afternoon I pressed with my thumb(nail) on the screen and immediatly the screen broke again, with black on the side and red and black and blue lines appear. i phoned SA Cell World immediatly and told them they sold me a faulty screen, witch i paid R1600 for. They person working there told me he wil let me know when the power button is also there then he will repair my phone. My wife came there today, he refused to fix it saying my kar keys or something broke the screen again.. and was very Rude to my wife.. This is unacceptable and strongly suggest not take your repairs to these guys, as there parts are not good and service is rude...