For your account to have been hacked you would have had to have been phished or gotten very unlucky with malware, key logger etc. Assuming you haven't recently opened an account on Atlantis using the same credentials as your SR account the probable issue is just that your pass phrase stopped working, it happens occasionally normally after the site has been down for maintenance. No one knows why it happens, it just does for a few people. SR support should reply to you soon and if you have followed the correct instructions for a pass phrase reset request you should be back in control of your account very soon.