About 2 months ago the stop/start fault code started appearing on my Audi A4 2017 dash, following this I booked an diagnostic with my local Audi Centre (Jardine Motors UK) for 29th July. Two weeks ago however I also got the brake servo error too, which I bought and replaced with a genuine part, clearing the error from my dash and fixing my brake pressure. When I've brought the car for a diagnostic however, the workshop has been adamant that the stop/start issue was due to the brake servo error still showing internally despite the fact my brake pressure was completely the norm and had cleared from my dash. Argued with a service manager for an hour about the brake servo not being an issue, and when they finally replaced the same exact VW part with the same one, initially trying to charge a full £170 for a cheap part that takes 3 minutes to change, the stop start issue still remained with them having the audacity to tell me the issue was already fixed despite the stop start error popping up straight away when I started it. Apologies for how long this is, but I would just like some advice regarding what I could argue. It just seems like a case of massive incompetence from their part, and refusal to acknowledge that it could be something else.
