Well, you still have to rake $600 to release it, so I don't think Party minds, they still profit
You'd have to call to confirm but I assume you can cash out and not void it, because it doesn't appear in the client as a 'bonus offer'. I've only seen the 'if you cash out, you'll forfeit your current bonus offer' warning for bonuses that you see under the bonus offers menu
Live chat never works for me either recently but someone picks up pretty quick whenever I
call, just costs a few cents via skype