How to activate a Hellcase.com Wallet Card Code key?

Activating a Hellcase.com Wallet Card Code key is really simple, just follow these steps:

1. Copy the code that you’ve received.
2. Visit https://hellcase.com/ and sign in with your Steam account
3. Press ‘Plus’ button on the top right which stands for filling up the balance, paste the code you've received into the Promo code field.
4. Your balance will be filled up for the sum equal to the price of the Wallet card you've purchased plus the amount's if you reached any.

The key is not working

If you have activated the key according to the guide but the code appears not to work, please check what type of error message you receive and depending on it follow the appropriate instructions:

• My key is Duplicated / Already Used. How can I proceed?
• My key is Invalid. How can I proceed?
• My key is region locked / can't be activated in my country. How can I proceed?
• My key activated a different product that it was supposed to. How can I proceed?
• The key I bought didn’t activate all of the content it was supposed to. What can I do?