<prompt> Human: Original Post:The bank told me I must cancel my original claim, and resubmit two different ones - one for the double charge and one for the overcharge 35 instead of 40. Supposedly, not having a receipt showing I should have been charged for 35 is holding everything up, including fixing the obvious double-charge. Im leaving for vacation today so I dont have time to do this. Ill deal with it when I get back. According to them, Mastercard is the ultimate arbiter in this matter, and they are just following the rules Mastercard gives them. Also, I filed a complaint with the NYC Department of Consumer Affairs against the business. I received lots of good advice in the original post and I wanted to give an update. Im not shaming either the bank or the business until this is all straightened out - Ill post a final update for other people to reference at that time as well. My guess is eventually Ill get the double charge back but the overcharge is a lost cause.  <response>: If the vendor isnt going to work with you, then the charges are fraudulent. Go through your banks fraud department. As far as the overcharge, the vendor should have your purchase on record... unless you live in some back of the woods town that only accepts payment with cash or favors. If thats the case your going to have to eat the 5 dollars. But to me, 5 dollars isnt worth the stress and all the fighting coming your way. Enjoy your vacation. 