it's a strange thing when you pick up your car from the garage and they've fixed something you didn't ask them to fix....and still want you to pay

It's been a long day, and I am really looking forward to tomorrow when I have to talk to the manager at Superior Auto about the fact that I shouldn't have to pay for work done to my car that I didn't ask to have done, while they neglected to do any of the work I actually needed doing.