Cannot insert credit card info

When I insert my name/address to add credits on my battle.net account (which is located in Argentina where I live) then I insert name/address and when I click “ok” the next page that SHOULD permit me insert my credit card info does not show anything… only an error…

I already tried on 3 computers, 3 mobiles, chrome/edge… but nothing… clear cache… disabled anti-virus… but nothing…