The Nioh 3 key doesn't work in my country.

I bought a Nioh 3 key and it doesn't work in my country. The key I bought was a Latin American key and I can't activate it in Brazil. No response from support and no response from the seller. How can they claim to be the biggest key site and not have 24/7 support??? How is a fraudulent seller selling on the site with so many positive reviews?