https://www.kickstarter.com/projects/cze/hex-mmo-trading-card-game/posts/1566551 here was the forum notice that should have been accompanied with an email. If you had fired up the client at any time after Nov 2015 you would have been ok, that's a long time to do nothing with a $250 investment anyway.
I found this quote from a dev 'For anyone that feels that their accounts were deleted in error, I know this is frustrating but please know that this is not the end and your accounts can be restored.
For now, please send a ticket to support.hextcg.com/ and once we know how to start any restoration processes we will be very glad to assist you.
I must inform you however, that right now it might take a while before you get a reply - however you will get a reply.
There was a mail sent out recently informing everyone that this was happening. '
So hopefully you can get your stuff back. (btw, the update I posted was also posted to Kickstarter as an update and if you were a kickstarter backer you should have also received a notification of that one)
edit: also this '
The deleting process has been halted and all affected accounts will be reverted. This process might take a while, but your accounts will be returned to normal status soon.