Phone came back with more damage than when it was ...

Phone came back with more damage than when it was sent off!
Would not recommend using them to anyone. My phone was sent off with the screen being damaged by liquid damage. However my middle button and lock button were in working condition. Since they had my phone my lock button at the side (iPhone 6) no long works. I asked them before they sent the phone back if the screen was the issue remaining with the phone. Vicky at quickfixmoblie didn't know which wasn't reassuring so I asked for the phone to be sent back. When I received the phone back I realised the lock button was no longer working.