If you live in Brazil and the game is suffering from 300ms+ latency, the real latency we should be getting is between 190ms and 210ms. Telefónica is routing 204.2.229.0/24 packets through Amsterdan. It only happens between Telefonica and NTT. Running this check to test the latency of the AWS CA servers can be a rough simulation of what you should be getting.

If your traceroute log shows hops named "ae1-0-ntt-grtamstc1.net.telefonicaglobalsolutions.com" and/or "amstnl02.nl.bb.gin.ntt.net" I encourage you to call tech support and apply generous quantities of salt.