You put your down to Hold the vehicle, to prevent it from being sold to someone else.
You read the Contract and it said, in tiny print, SUBJECT to final Financing. You were NOT approved by the Financial Institution for the purchase, you were accepted for Potential Purchase subject to approved financing.
Your 1000$ means the vehicle was less than 5,000$ (20%).
If you could not get a Loan from your own bank (personal preferred, auto if it must) you were in trouble from the start.
If you have problems with the dealer finance officer, you may contact your State's DMV, Licensing Office, they usually have a web site.
And No. It is very unusual for a dealer to refund the Deposit. The deposit is money the dealer earned by keeping the vehicle off the market.