Buzzmeeh — iphone stopped working after repair by buzzmeeh company

Buzzmeeh company sent the person to repair my broken screen. after the repair my phone's speaker stopped working and after that phone started rebooting. these guys gave warranty but nobody turned up for repair and when I called them they were responding loudly and badly. they have not even provided service to me. My phone is not working at all now. I believe he stole something as well. he screwed my complete phone.