Damaged my car while replacing my windscreen

PG Glass fitted my new windscreen, after completion, I reversed my car back into the parking and I immediately got a warning light, \automatic headlight/wiper malfunction". I had to call the call centre after several minutes I finally spoke to somebody who arranged the installers back on-site. I told them the error and they argued but eventually fixed it. When I got home I then realised that the left-side reveal molding was damaged on top. Nobody could assist me as it was after 5pm. This experience was extremely frustrating and is a reflection of really bad workmanship and is totally unprofessional. """