Are there so many days to return a used car in Indiana after you purchase it?

After I purchased a used car, I realized I was charged for extra options that I did not want. Also, the interest rate was higher than they quoted, they only gave me trade in value for my car but charged me wholesale for their car. I realize I signed the paperwork. My stupidity, their dishonesty. I can't find out if I have a time frame in which to change my mind and return the car. I have contacted them and their response was, you signed the paperwork to purchase this car.|||You have a 3 day right of recision on used cars. They may be trying to stall you so you run out of time.|||Wow that is what you get for not reading! talk about getting rammed. It is only money, at least it isn't jail time?