Mudei meu plano para duo, fui cobrada duas vezes o valor e não liberou.

[#1]

Foi cobrado duas vezes a diferença do plano individual para duo e ainda não liberaram.

[Vasil]

Hey there!

I hope you don't mind us replying in English 🙂
Folks shouldn't get charged with the difference between plans to begin with, your payment date gets shifted instead.
This should best be checked with our support folks. They can view your account and let you know what has happened.

Hope this helps!