Car scratched after visit to the workshop

Hi. I had my Golf VI repaired in a workshop and picked up the car a short time ago. I discovered, however, that the boot flap and bumper are scratched in the back. Quite a lot of small scratches are on it. Serviceman said that I should stop by next week so that they polish everything and it is no problem. Only at home I discovered that my speedometer display, audio player display and T-pillars are scratched at the doors as well. The car had inside & outside and apparently someone had had a dirty rag, because it makes an impression as if it had been created from the sandpaper. Ok, trunk flap and bumper polish it to me. But what should I do with the remaining scratched parts and how should I best proceed? I can’t put pressure on the workshop, can I? Does anyone have any ideas and/or experiences? Thank you.