I received an email from PayPal regarding suspicious activity with my account. Someone was requesting a considerable amount. There was a phone number to call to request a refund and, alas, I called it.
Don't do that. I ended up with someone who purported to be helping me, but the call went on and on and finally I got uneasy and ended it.
Back on the PayPal page, there was a way of dealing with this problem and, indeed, a warning about this very thing.
So, with passwords changed and bank account blocked for the time being, that's how I spent afternoon. Fingers crossed all will be well.