Originally Posted by GRUflyer

They CANNOT. They can be sued by doing that.

The law is Brazil is very clear: Airlines must not charge any fees other than Airport fees on the advertised price of the ticket (cash or miles). This was ruled out by the Brazilian Client's protection Court.

So, just call and "remind" them of that, they will drop it right away! Or you can take them to Court and earn a lot of money....