When I bought MONA, the withdrawals was unavailable...
Why did you buy MONA which withdrawal was unavailable, shameless boy?
The only thing I would ask would be... When you bought MONA, and you now say that you could not withdraw that MONA when you bought it (how do you know?), why did you not sell that MONA and get your money back? Unless there was an extreme difference in buy/sell side and I mean extreme.
I won't tell you that every time I buy a coin I check that I can withdraw it.. I maybe wait about 5 minutes until I actually want to withdraw it (because holding any coin on any exchange is stupid).
Holding is but trading in the margins makes it a necessity to have coins on exchanges as you well know.