Bad service

I had a damaged screen, I took my phone to samsung nicolway to be fixed. They fixed my screen and after a day it was coming out. And I took back the phone to nicolway today and they said the battery is swollen but it's not. And even you take the battery it's still coming out. Sometimes now my phone goes blank and I have push it back. I'm really disappointed with Samsung. I was happy with my S5 before I took it to samsung. And when I get it back my screen is coming out and sometimes It get blackout and the battery now is swollen. Only God knows