When you picked up the vehicle, did you agree to the $468.13 rate? You must have signed something and you say, "I saw a different price...."

As to the second increase, unless you agreed to it, it should not be there.

Yes, you may file a chargeback, but you will need to contact the merchant vendor first to attempt a resolution. This might be as simple as sending an email with your final agreement and original confirmation attached, asking that a refund be issued immediately for the difference. 1-2 sentences at the most. Wait a week and then file a chargeback.