General   (General discussion, talk about anything.)

I took my mum's car to a garage for MOT and the garage did similar to your experience. When I went to collect it, they handed me the bill. Some things, such as the windscreen wipers and bulbs had been changed. Of course, the cost was much higher than buying these myself and doing the work, which is simple, myself.
Anyway, I told them that I wanted them to take them off and put the old ones back. Of course, they said that this wasn't possible because of blah blah blah. I told them that it wasn't my problem, because I had not given my word for them to do the work.
They must contact you about any issues / parts which they think should need replacing. You have the option, and this is: to do the work yourself or to agree to them doing the work at the price quoted.