My wife and I were on a flight from Mumbai to Kathmandu at 0810 on May 2 of this year. We were told when checking in that we could upgrade for $120 each. After agreeing, we were told to go to another station to pay. That person took our credit cards but did not give us a receipt. He said it would be emailed to us. That never happened. We were assigned seats 1D and 1F. The seats and flight were fine. When we returned to the USA, we received our credit card bill. Instead of the expected $240 for the two upgrades, we find that we were charged $359. We were obviously given the wrong information but have no receipt to show for it. We would like to be reimbursed for the overcharge.