I would also be very careful with this!! I have tried contacting them via the website email twice and via twitter too, and not heard anything in reply! Until they can be bothered to reply I won't be investing any more in this.

13 Oct 2017 08:29pm
252.56428504 GRX
0x465D7e3e2a98b500834A2975dC506F4c5BDAb74B

Amount: 0.344 ETH

https://preview.ibb.co/eD6jWR/grxcoin.jpg