By law when you put a down payment on a car do you have 30 or 40 days to bring the rest of the down payment

I put a down payment on a car and the dealer told me to bring the rest of the down payment the next month. Well the same day the payment was due I started getting calls twice a day from the dealer he continued to call even stating he would go to the collection process. After a week the repo man knocks on my door to pick up the car...