I purchased XXXX airline tickets on XX/XX/XXXX at XXXX, i was paying for those tickets XXXX XXXX, the conversion rate on that day for XXXX US dollar was XXXX according to XXXX XXXX, the following day XX/XX/XXXX the rate for XXXX US Dollar was XXXX XXXX, when i got my statement in the mail I got a whole different picture, the credit card company postponed the transaction for almost a week making the transaction date for XX/XX/XXXX and the posting date for XX/XX/XXXX, the conversion rate on XX/XX/XXXX was XXXX XXXX for each US Dollar, this made the total charge to go up from {$2000.00} US Dollars to {$2500.00} US Dollars, I contacted the merchant addressing my concern about the date difference and they sent me in an email with all transaction information which clearly shows that the transaction was made on XXXX XXXX which supposed to making it post on XXXX XXXX, I contacted Barclay 's Bank and they instead of fixing the issue files a dispute against the merchant which I never asked, the merchant replied with evidence showing that I authorized this transaction which is true, in their evidence they show the authorization details and there it also says that the transaction was made on XXXX XXXX, Barclay 's Bank accepted the merchants rebuttal and returned the charge to my credit card, I wrote back to Barclays Bank explaining my problem that I am not disputing the merchant but requested the I should be refunded the difference of the XXXX rates which comes out to about {$450.00} US Dollars, they denied my request saying that they ca n't further assist me with this issue, I called up Barclays Bank and they said there is nothing I can do to fix this issue and they refused to refund me the difference between the XXXX amounts. 
I paid for the transaction because I did n't want to hurt my credit history, I never agreed to the full amount of the payment. 
