求助：修車的在坑我？

I have a 2005 Toyota sienna which is excellent condition. On march, I took it to local firestone station to change engine oil. I was told the brake light was out. I gave the green light to change the light. I did not expect my nightmare started. The next morning, I can not switch the gear from p to d. I told them the problem and was told accidentally the " switch" was broken. I argued with them and they fixed it for free. Then I noticed the airconditionor in the back was on even I turned it off when I hit the brake. I called them again, they looked at it and told me everything was fine. I did not notice it after. Last night, I was stopped by the police that all the lights in the back was not on! I do not usually drive at night so I do not know it was a problem until now. I am very angry at the firestone. Now they said it is not their problem. Are they liar or it was my bad luck? I complained to their main company and still wait to hear from them. Any suggestions? Thanks a million!