budget car sales signed a contract to purchase a vechile, drove in it for two weeks, and they took it back montgomery Alabama

bought a vehicle from budget car sales, have the contract where i purchashed the vehicle, rode in it for two weeks, then they told me to come in and sign somemore paperwork. they say i cannot leave the car lot with the vehicle, they cannot finance me. i got a forty hr a week job, stay in a house that's paid for. my grandma pay all the utilites, absolutely no bills. they had a $49.00 down and drive weekend sale. so i go over there to purchase a vehicle. they say they couldn't finance me for the $49.00 down deal. so i tell them, "i got money in my pocket". i was about to walk off the lot, they stop me and said, "we gone work something up for you". i give them $500.00 down payment, i drive off the lot with a vechile, two weeks they take it back. i ask for my down payment back. they say i need a recepit. i give them the envelope that they gave me with the contract in it, and there's no recepit, they never gave me a recepit. and told me i got to find a way home.