Updated info of My car which is messed up by the dealer

Dealer called me today. He said they ordered me a new key cause my old key was not programmed well. I've been using my key all the time. I've never had any problem with it. It's so weird.

He said I could pick it up today. But he told me he found my horn wasn't working. That was totally bullshit. I use my horn often, never had problem either.

What did they do to my car! Should they check out my horn? I think they must did something wrong to my car.

Any suggestions? I want to find out what they did before I drive my car out of their garage.