Well sounds like they basically ignored the court[1]. If you don't bother turning up to defend yourself in court, you'll almost certainly lose.

WhatsApp should decide how much they care about Brazil. If they care, they could have bothered to send a lawyer. If they don't care, then they shouldn't complain about their service being cut off.

[1] https://news.ycombinator.com/item?id=11615056