Not exactly the same problem but a couple of weeks ago I opened a new Pay Pal account to buy an item from an online seller. All went well until about a week later when I had a request from Pay Pal to verify all my details including my PIN number. I was very suspicious as banks don't ask for this information on line so I didn't reply.
On looking at the Pay Pal web site it appears that their customers are vulnerable to Phishing attacks. So I would be very wary of giving any info online. They also advise changing your password at regular intervals.
Regards and be careful