Am I obligated to keep my used car purchase if the dealer messed up the paprwork and wants me to re-sign?

Question Details: My husband and I bought a car about a month ago. We registered the car and now the dealer says that their paperwork was wrong and that the VIN number is incorrect. During the signing we were told we would obtain four oil changes for free during the life of the car. They added that into the price instead of waving the fee all together as they stated. On top of all that, they added an extra $50 to the purchase price. It was late and neither I nor my husband wanted to haggle anymore. Now that they have found an error in the paperwork and want us to resign, can we ask for a refund on the "free" oil changes and the extra $50 added to the purchase price? If they do not agree, can we walk away from the deal with no penalties?

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