Me and two other people in my guild are all having the same problem.
We all bought it from g2play too. If it was a fraudulent key and Arena Net has downgraded us it would be really nice for them to inform us. Just say – yes you’ve been downgraded, it’s not a glitch. Then we can start getting in contact with the reseller to try and recoup our losses.
But until ANet confirms what has happened to our accounts we are really just stuck waiting.