3) Anybody calls you and says they are from your exchange and request for access/password,just hangup the call !
Only fools will do it. I'm not sure the scammer will succeed this way.
but to watch out for this might happen. you should check every information that comes in so that it is not fooled by fraud.
This is a very basic way to scam someone but I feel the community is wise to know not to answer such calls. Theres a new blackmail scam happening where they shoot of mass mails by saying they have caught you enjoying watching adult entertainment, and in other they say theyll do negative seo on your website. In both cases theyll send you an address where you need to deposit bitcoins, but never deposit any coins on those address as its false they wont do anything.