Shocking service

I booked in my device at Cellucity Melrose for a screen repair, got the device after a day paid R899 but now noticed that the device has started to freeze every time I try to use it. Took it back to Melrose they booked the device took them a week to get a different screen but still same problem. I spoke to the apple doctor manager who booked in my device again for a week again still the same problem continues. Booked it in at Bedford for a week again the device was never even touched or worked on for a week. I emailed the CEO he didn’t even bother to get back to me. *** service