I’m reaching out to you on behalf of a friend who could really use some help or advice. This is about Scarlett Johansson Jr, a 2012 c30 r-design and this car is his absolute favorite thing in the whole world – but she’s in trouble!
He trusted a good friend to install a custom sound system for him --- this guy is great with other cars but it seems he knew nothing about Swedish engineering, bit off way more than he could chew, made a lot of promises he had no intention of keeping, and the project became a total disaster. He took my friend’s money and quit and now both the car and their friendship are broken.

We don't know where to go or even who to talk to about getting this whole mess fixed. The car is under warranty and due for service but we’re not sure how much the dealership is even willing to cover, especially since this was a custom project. There's a bunch of weird little things unplugged/broken, interior paneling that got manhandled, plus a new alternator to handle the sound system that never got installed. We've got no tools and no experience with this type of DIY.
Any advice, names, recommendations, shops, suggestions you could give me would be so, so helpful. He doesn’t know where to turn right now and he’s broken up about the whole thing --- guy really loves this little Volvo. Thank you again for your time!