I cannot buy items from Shop

Hello,

Today I bought a paysafe card to change my name!

As you know in Greece that I live,paysafe cards are banned and the only way to put money via paysafecard is on steam!

I downloaded Steam and Tanki Online and I tried to purchase Rename Pass!

When I click on Rename Pass to buy it,button is not working!

I mean that I press all the time the Rename Pass but is not working!

Same for all other items!