When you next get to talk to them, have a few questions written down on formal looking paper. Clip board or some-such. Plan these questions carefully - mindful of Mike's comment about them going on the wrong side of the law looking at your email - and ask these questions as though you've been briefed to get specific information. Refuse to discuss the reason, or any third party, but word it as " I gather I need to have these questions answered." If they decline, suggest they are germane and you're told you have a right to know. etc., etc.