sounds like they changed the ECU without resetting it to your car's computer code. Just get them to run the diogonstics and change it to the way your computer was suppose to be. Or just ask for the money back. Its not really that illegal, just an mistake even if they did it, they can just say they forgot to set it, you can't really do much about it, but ask for your money back tho, because you don't know what else they changed and didn't tell you.