If you don’t have one you can trust, then find one that doesn’t do serious repairs- less incentive to find fault. I’ve got a good garage nearby but before I found them, I took the car to a local truck place.
Either that or if you can, tactfully let them know that any repairs won’t be happening there! My dad insists on using his local garage, has done for 20 years, but they’re bent as a 9 bob note and he knows nowt about cars so they’ve had a fortune off him down the years. (they charged him for new brake pads 3 years in a row, the car does about 1000 miles a year!) So now I deal with that for him and when I drop it in find some way to mention that I do all the maintenance on it. Since then, never had any problems.
At work we use Halfords, never had a problem- but then they probably value our repeat custom.
But best option is to find a good garage. Personal recommendation is golden.