Everyone that joins ICOs, bounties or airdrops might recently be receiving some emails purported to be from a project administrators informing you of that your earlier contact of the support has been escalated and you need to be a certain sum of bitcoin or ethereum in order to abade the problem otherwise, you lose your investment or earnings.
It is a scam. Beware!!!
I think most are aware here regarding this modus.
TIPS: Dont ever click anything on your email specially those who saying that you have been rewarded of coins or tokens and just verified the link to claim the prize. Those are petty scam that if you click say goodbye to your tokens on your wallet cause it is 100% phishing site.