2003 Mercedes C230 Kompressor SAM Unit

I have a 2003 Mercedes C230. I had the windshield replaced and months later had water intrusion into the front same due improper installation of the windshield cowling.

I finally decided to have the car looked at after realizing what had happened. The mechanic had the car for 4 months. He was to have checked the from same and replaced if necessary. Well he did not do a thing except now my radio, instrument cluster, fuel gauge, turn signals, hazards and rear sun screen no longer work.

I went ahead and replaced the Front SAM myself thinking maybe that would correct those issues today. Well, it still has those issues.

What do you think the mechanic monkeyed with that would cause these issues, that I never had before?

He was referred and will not tell me anything.

Thanks