Now the payment is successful, but it shows that the goods are not purchased.

I paid in the browser UE4 mall and bought UE4 scenario resources

There were no computers and no UE4 landers installed.

Download the lander and log in to the account

Scenario resources found to be purchased need to be reimbursed

Payment records also disappeared.

Now I only have a trading order number.

What should I do to deal with this situation?

Thank you