Excellent service at branch but i cannot rate the repaires department at all

I purchased i Tab phone a few months ago, had the phone for a few days, Phone screen just went black, i took it back for repairs , It was at repaires for more then a month, I collected the phone . just to discover the phone doesnt read the sim card . i took it back for repaires again where it was for more then a month again if not for longer. one the staff member whom was and always is very helpful advised me that repaires are not going to oor are not willing to repaire the phone where does it leave me as a customer? Please advise accordingly please