Sometimes payment processing system may decline a transaction. Usually it is internal failure and you will receive the money back to your account within 15 businesses days. The exact date depends on the bank's policy.
If you have not received a payment, please briefly describe the issue and provide us with all payment details you have (dates, amount, screenshot of transactions).
Steam (Steam Wallet) payments
Please contact https://support.steampowered.com/. They will help you out with processing the payment.