We are sincerely sorry you faced such a confusing situation.
Please note that we don't have our own payment system, and all payment transactions are made through your payment service provider. They are responsible for all payment transactions and work with your payment card.
We advise you to request a refund for the second transaction if you are sure you purchased only once. Follow one of the links below, depending on your payment provider, to do that:
iTunes
Google Play
Facebook
Microsoft
Amazon
In addition, here are some recommendations that would help you prevent such situations in the future:
Before making a purchase, ensure your Internet connection is strong and stable enough.
When making a purchase, avoid clicking the "Buy" button multiple times or refreshing the app/browser while the transaction is processing.
Allow the payment process to complete and wait for confirmation before attempting another transaction.
Check your bank or payment provider account after making a purchase to ensure the charge has been processed correctly.
Wishing you successful purchases and enjoyable gameplay!