Pathetic customer service, terrible workmanship and old parts

I took my car in March of this year (2020) for a sunroof replacement as the sunroof had cracked due to stone throwing. Prior to this, my car had no scratches, dents and EVERYTHING worked. After my car was ‘done’, it came back with a huge scratch on the front bumper (the type of scratch you get from knocking a wall/pole) and my headlight wasn’t working (the same side the scratch was on, they did replace the bulb though, although my lights worked perfectly before going in) I did not scream or make a noise as I informed them of the damage and they said they will fix it at no cost to me (I have this in writing). The sunroof work is extremely poor, especially when you open the sunroof you see black windscreen adhesive on the paint of the car that’s not even app**** in a straight line. Fast forward 8 months later, the car is still not fixed, the huge scratch still exists. I received a call a few months ago saying that they’re busy and they will attend to it when they have a slot but nothing has been done. No attempt has been made to contact me or inform me again when they’ll possibly have a chance to fix my car. I did not even ask them to repaint the huge scratch, just to replace the VPS that is scratched, but this they cannot even do even though it’s probably outsourced to VPS themselves which are 15 minutes away. Also, they put on one of my pre-existing damaged components that they have charged my insurance for a brand new part as the part is on ‘back-order’ from Germany, now while I understand what back order means, a brand new car from Germany could’ve been ordered in these 8 months let alone a wind deflector for a sunroof. Overall this has been a terrible experience and will never refer anyone to Technostar auto body, even if they hate their car.