What can I do against a dealer who failed to contact me and is now forcing me to accept a higher rate 45 days after purchase?

Question Details: I bought a used car from a dealer and paid off most of the car price (80 %) and financed the rest. On the day of purchase I signed everything and they made me sign the financing paperwork and I took the car. Now, more than a month later, they called me saying that financing didn't work out and I have to either return the car or accept much higher interest rate (3 fold of what I signed). What rights do I have against them? They failed to call me inform within 21 days of purchase which is written on the contract. .

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