iphone 5c repairs

I gave my iphone 5c in for repairs while it was under gaurantee and because of the incompetance of the shop it was returned and booked in 3 times.After the third time I got a quote of more than R3500 to repair it because now after 8 weeks it is out of the gaurantee period. I last had my phone the 18th of Feb, gauratee valid till 22nd of Feb. I have records of all the sms'e received and all the job no's. The service at this specific shop is not good and the people working there is incompatent