Nuuvem

Gave me a duplicate Borderlands 2 GOTY code, then refused to issue a refund until they'd "checked it with the developer". Dozens of emails and months later, they still haven't refunded me or issued me a code.

Disgusting scam artists. Stay away if you're from Brazil, as US/EU laws don't touch them, so they can pretty much do what they want. TERRIBLE customer service.

UPDATED

Ok, I have to confess that despite being ripped-off by Nuuvem previously (I purchased a game and they gave me a region locked key, then refused to replace or refund) I have used their service since. They really do have the best prices on games sometimes so I caved. That being the case I felt it would be hypocritical to give them a 1star rating and call them scammers while availing of their prices.

To summarise: Nuuvem often have the best prices on Digital Game purchase but make sure you go into it knowing that their is the possibility they'll give you a key region locked to Brazil and then refuse to refund or replace it. My approach is to only purchase from them when they have the absolute best price on a game I really want.