well I remember when all these ICOs were gathering cryptocurrency users information in the name of KYC I said that they are just accumulating information to sell and use for these kind of scam and also advertisement. now you can see what I mean! the most obvious one is the Email spam, social media spam and now this is the newest method with calling spam/scam.
if you are already in a database like that somewhere be sure that you are also a target.
This is strange. I supported the idea of ICOs using KYC sue to the increasing number of scam ICOs that were evolving. It is rather unfortunate that some ICOs take details of participants and leave them loosely for scammers to feed on genuine, unsuspecting investors. I hope people would be more careful in choosing ICOs. And I hope people get to realize that BTC transactions son't need the consent of any third party.