I don't know about CA, but here in MI, you also signed a piece of paper that says you give the dealer the right to correct any errors made. This would include the need to re-sign the lease paper. If that is the case, you will have to re-sign. Anyways, the lease contract is with the leasing company (chrysler financial), not with your dealer...You would have to prove in court that you only would have entered into the lease if the overage was 15cents a mile. I think that would be hard for you to 'prove', since the $299 is probably what you convinced you todo the lease (along with the beautiful car). BTW, don't worry about the reviews...If you listened to all the critics...you would be driving a Honda Civic Hybrid and never go see a movie.