dealer took me for a ride

[ARK1]

I live in Indiana.and purchased a used truck from a dealer in same state. I had a trade in which I still owed some money on,what the dealer did was they took the price of what I owed on the trade off the original price of the vehicle I purchased,then after adding in finance charges,taxes,a couple of different insurances,one or both of which I now dont think I really need,they added back in the money they gave me for my trade in,payoff on it.I got the new truck on a friday,and the following Monday I told them I didnt want it and that I wanted my old truck back.They said that they had already sold it to I assune a buy here pay here lot.They said the deal was done and there was nothing they could do.I thought I had 72 hrs. to change my mind.So what I would like to know since they sold my old truck and got the money back they gave for the payoff,can they legally also put it in the financing and double their money on it?Is there someway I can get the bank to refinance without the insurance that was added in? One of the insurances basically covers the extra money that was financed in for my trade in.