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Incorrect Diagnosis Drama

This is a first in terms of owning an Audi A8. I will agree that the vehicle is of age being a 2016 vehicle so expect a few bills and knowing the car I own the bills won't be cheap. In the middle of Mar 2024 I had the Air Suspension fault lights pop up on the dash warning me that the vehicle was too low to the ground and that I had to drive slowly. I took the vehicle to Midland VW in Cannock who immediately informed me that I would need to take it to Audi with the closest one being Wolverhampton for diagnosis at £140. Got the vehicle booked in no issue and had the diagnosis back saying that the Air Suspension Compressor was seized, fuse blown. Recommendation was to replace the compressor at a cost of £2400 and then secondary measure a test on the electrics which was a further £600. At this point I took the vehicle away and ordered the same branded Air Compressor (WABCO) from Germany at a fraction of the price. The fitted price of the compressor was £554. At this point the mechanic who fitted the new compressor advised me that the original air compressor was functional and also demonstrated this to me. So at this point I called Audi Wolverhampton again and informed them that a new compressor had been fitted and that the old compressor still worked when direct power was given to it. Took the vehicle back in and informed me that the vehicle was incorrectly diagnosed and that the technician should have looked further into the issue and would have found an AD BLUE leak in the spare wheel well and that the old compressor was not seized. At this point in the dealership the service team agreed to fix the issue free of charge as they had incorrectly diagnosed the issue which I feel was fair. Left the vehicle there and then 2 days later I receive a phone to be advised that they did not incorrectly diagnose the fault and the compressor would have eventually seized. The point was that why would I replace something that is not broken and if I was informed of the correct fault that is what i would have got them to fix the issue. Now I was thinking that it is a good job that I did not hand over £2400 for the compressor and £600 for the electrical testing. In the end they agreed to carry out the work free of charge but they took nearly 2.5 weeks to repair which was a local repair on the wiring loom. I got the vehicle back and a few days later the air suspension fault has reappeared and the car is now on its backside. I have tried to go back to Audi Wolverhampton and have informed me that I need to start all over again and they need to diagnose again. What this tell me is that they have not entirely fixed the issue and i cannot go back to them unless I fork out more cash. I do not believe I can trust the dealership with completing work on my vehicle.