Tried to get my tire patched

I had a tire on my car that needed to be patched after getting a nail in it. We used the kit that came with my car which included a Fix-A-Flat type product. This was the only place open past 6:00 pm, so I decided to give it a go. I called before I even got in there just to make sure they could take care of the problem, and the guy on the phone, who's name is Cameron, was nice enough. I don't really know a lot about cars, but I just wanted to get the tire fixed. I got in there, and sat down in the waiting area, and around 5 minutes later, this Cameron fellow comes and tell me that the Fix-A-Flat deteriorates tires and that I need a new tire, which I now know isn't true. At the time, I just wanted to get it fixed, so, not knowing that this man was exploiting the fact that I am a young woman still in my teens who isn't car-savvy, I bought the tire, and they put a used tire on my car. By the request of my mom, I had asked for the damaged tire back, but Cameron just brought it back in with the Fix-A-Flat still in it, and didn't even clean it out. Luckily, after I had called my dad, he told me he would take care of it. Now, they are supposed to me pay me back for the new tire, $90, but I still don't have my money back. I now know never to go to these people. I can't help it that i don't know everything about cars, and it is just plain wrong to cheat someone like that. Never go to this place unless you want people to lie to you while they cheat you out of your money.