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If you had a contract
for the new lease, which was not dependent upon the old lease, you have them for breach of that contract as you have a right to enforce that contract as written. If they refuse you have a right to sue them for breach of contract
and seek specific performance or actual damages you suffered as a result of the breach.
Unfortunately, the damage to the returned vehicle is another problem. If you did cause the damage to the other vehicle by driving
it through the water, then when they discovered that damage you are liable for payment for that damage and that is an issue separate from your new lease. If your car was insured at the time, you need to file a claim with your insurance for the damage caused by flood or high water if you had comprehensive coverage to cover that damage. The dealer should not, however, be mixing the old contract of lease which imposes liability on you for any damage found upon turning the car in with the new contract unless the new contract referenced the old vehicle contract.
If you received a waiver or clearance of the old vehicle stating they accepted it and there was no damage, then you can argue that the damage to that vehicle was their fault and not your fault, since they signed saying it was returned in working condition without damages and you can fight owing them damages on that old lease claim.
These are your legal options if the dealer is refusing to negotiate or discuss this matter.
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