Don't worry I agree with you, I've flipped flopped on main dealerships, been gutted at times after giving them the benefit of the doubt, my car - my wallet, I do my best for my company when I was young enough to work, really the minimum you should be aiming for.
Audi gave me MOT advisories 2 years ago wrt rubber bonded bushes, okay they were a typical failure point on cars of that age that had run many miles, but my car had not, and its suspension bonded bushes are like new due to very low mileage - I left them as far as MOTs were concerned after that, once mistreated/cheated twice smarter, another lost customer and who does not hold back when advising other local Audi owners. Customers treated fairly can be your best source of new customers, mess some of them up, and you will pay the price.
Edit:-I would hope, in an ideal world, any good mechanic or tech, finding that he/she was being mis-used by his employer, could find his/her way out to an Indie who relied on word of mouth for customers.