What options do I have if the dealership that I purchased my car from needs me to change the deductible?

Question Details: I initially was told that I was approved for the great financing that not many quality for. I signed the 5 year no money down contract and made arrangements to pick up the car the next day. I asked for the VIN so I could shop for insurance. I switched my old car out, added comprehensive and collision and opted for the 1K deductible. However, when I went in the next day I was told there was a hiccup and that I actually did not have a credit score even close to qualifying so my only option was less desirable financing which is now a 6 year. Being late for work, I reluctantly signed, got in the car and drove away. Now 2 weeks and 1500 miles later, I have 3 messages from the dealership saying the bank will not fund them until I switch to a $500 deductible. This turns out to add just over 3K more out of my pocket for the duration of my loan. What options do I have?

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