The worst, asked for new battery, now screen,camera and speaker is broken. The technician broke my phone

Tool my iPhone to replace the battery yesterday. After an hour I was told the button doesn’t work I advised the technician that it did work he will have to check again. So he did but he broke my iPhones screen, there was no stock on the white screens dor my phone so now there is a black screen on a silver phone which looks terrible. Along with my broken screen my camera doesn’t work and I cant take phone calls. We are furious. We trusted the technician would know what he is doing. Now we need to replace the phone!! At whose cost??? -absolutely terrible, we will never again support apple doctor and will never advise anyone to do so