bad service

Had sent my samsung S4 to have the screen repaired, was told it would take 3 to 5 days to get it back and it was free to fix it. Day 10 no response to notify on progress, called and was told I had to pay R894 to have it fixed as there is a part they would need to buy. After being told it was free I agreed because I was desperate, its now 3weeks still don't have my phone. I called this morning and now I am being told they are awaiting parts from overseas. No commucation nothing.