If your order could not be processed but you see a line item on your bank statement, rest assured that it is not a charge. Rather, the amount you're seeing is a pending authorization. That means it will remain pending until your bank cancels it -- as the payment was never authorized.
In short, no funds were exchanged and no refund is due.
Contact Your Bank or Card Issuer
Your bank or credit card issuer fully controls the process that removes pending authorizations from bank statements. While time frames for removal vary by bank, there is no doubt that it will be removed. Reach out to them directly for assistance.