I came to trade my truck in end of Feb. I brought ...

I came to trade my truck in end of Feb. I brought a co-signer, they took my truck and my $1600 down payment for me, added me on the contract and then proceeded to put everything fully in the name of the co-signer so now we have no way to register the vehicle being that I live in FL now. I am on the contract, my truck is in their possession now, yet I have no authority to register the vehicle I bought and pay for in my name? How does that even make sense? When my Co-signer went to the dealership to question them, they threw her out.