Car finance dept screwed up what can i do?

My husband and I purchased a vehicle on 7/22/2015. I traded in a 2012 Mazda 3 and we purchased a 2013 Honda Pilot. We signed all the paperwork and gave a 500.00 down payment. While there we discussed if we could transfer the tag off of my Mazda since it was in only 1 of our names and the new one is in both or off a vehicle we had at home that we were also selling. The finance guy said he did not know to just let him know and he would do either one/ We then left. A few days later the bank calls to verify everything and also stated the GAP contract was incorrect. They had charged us too much so it would have to be resigned. I told her that we were 2.5 hrs from dealership it is near Charlotte NC and we are in SC. She said not a problem they could mail to us. She told me to call the dealer and arrange for them to mail. I called and spoke with Paul and he told me no problem to mail and also updated him on the tag info that I wanted them to transfer the tag we had at home on the other vehicle. He had me fax the registration of the one we wanted to transfer.

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