What are my rights if I bought a new car that I was able to take home but now I find out that my loan was not approved?

Question Details: I bought a new car almost 10 days ago. I was told that I was approved through a credit union and they let me drive the car home. However, today I received a call stating that the credit union would not approve me due to the loan amount. I was then told by the dealer that they got me approved through another bank but the interest rate would be higher, thereby making my payment go up. I have not gone back to sign the new documents. I'm wondering what my options are to get out of this vehicle now. I traded in a car and was wondering if I would be able to get back in that? I am not sure how they let me drive off in a brand new vehicle when was not secured.

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