2] SUGGESTIONS:
A] CHANGE YOUR PASSWORD. Recent scammers have been able to access the account of longstanding members of websites across the Internet by hacking other databases/websites for login credentials. If a member is using the same username/password on multiple websites the scammers are able to utilize those credentials to login to ANY website where they are valid. They can run an Internet search for a username, and they are then able to login using that common password. Then, they impersonate a long-time member and try to make quick sales, OFTEN RESPONDING TO WTB ADS, or posting BELOW-MARKET PRICES on desireable items ... and demanding instant digital payment.
So ...
MAKE YOUR PASSWORD DIFFICULT: Use CAPITAL and lower case letters, numbers, AND SYMBOLS.
HAVE A UNIQUE, HIGHLY SECURE PASSWORD FOR EVERY WEBSITE! This is key.