HDFC Bank Credit Cards
CHARGED TWICE FOR ONE TRANSACTION

I have ordered devnetjobs organization job posting worth $45 and I have received the confirmation from the vendor 2co.com today morning. While doing the transaction, the first time I was told that it was unsuccessful, while the second time it was confirmed. Hence, my card has to be charged only once. However, I have been charged twice. The vendor has also confirmed that the transaction has only happened once (detail of the mail, from the vendor enclosed) Please help and reverse one transaction as I have only made the payment of $ 45 once only and not twice.