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Yes, you can make a dispute on both, especially on the second one because you should be able to mitigate the damage by the amount that the car was sold for. It is best to put any and all disputes into the Answer as this is your chance to prove that you actually have a defense so the more you put in that can be justified, the better.
In your situation, you can either agree to pay the rest of the cost, try to settle for a lower amount with the lender instead of going to court (this will cost the lender less money and thus, they may be willing to settle with you for a lower amount), or you can consider filing bankruptcy, at which point you probably would not have to pay this debt at all.