If you have made a purchase on Steam that has not arrived in your account, it may be stuck in the register. Try these steps:
Force close Steam. Then re-open Steam, open VEGA Conflict, and go to the VEGA Conflict store.
Close the store. This should prompt any delayed purchases to appear. This may take up to 24 hours.
If after 24 hours, the purchase does not appear, please contact Steam Support directly for a refund.