Airmatic suspension problem

Recently bought the car listed above from a guy who told me the car had some issues. He drove the car with a bad alternator and was over voltage the system until he parked it. He got the passenger fuse box under the hood replaced and the one under the rear seat. This was not done by a MB mechanic however which worried me. He also explained that the battery drains over time and was not sure why so he put a shutoff on it to prevent it from draining. The biggest problem? Airmatic system does not get any power. Both relay and fuse do not get power but every other fuse and relay works fine minus those two.

The center console buttons to make the car rise don't work, some other features don't seem to work, my gas gauge doesn't work. I get the follow messages on the dash: "display defective visit workshop" "coolant level low" even though the car has coolant topped right up and a few other things indicating lights burnt out, ABS or ESP isn't functioning properly etc.

My question is, why is both the relay and fuse not getting power but every other fuse and relay in the car working properly? I really do not like electrical problems.