Graviex is a total scam and stealing peoples coins. Stop using this exchange. They are not registered anywhere. No license to track nor office location. They can do an exit scam anytime. Stay away from this exchange as they are unlicensed.
Wanna make a scam accusation where everyone looking stands a chance of seeing it,Then make a fresh post in the scam accusations board, use this guide - https://bitcointalk.org/index.php?topic=260073.0
Secondly, why do you continue to use that exchange, yet it has several negative complaints about it.
I stopped using it already. Just warning people not to fall victim to their antics.