I dont think you can get a refund buddy and the term "hacked" is a bit vague in the sense that games don't really get hacked as I think your describing.
Also the game is in alpha so this isnt the final product and you problem might be fixed in the future.

Check this issue:
http://feedback.arma3.com/view.php?id=7741

BIS are aware and working on a fix. Otherwise, reports of hacking have no place on the tracker - closing.

Btw. if you want a refund, contact Steam or BIS directly. You won't get one here.