[Enyi]

Suleimana
I can safely conclude that your Mrs. O. has been the victim of the latest form of 419. You receive an email purportedly from the switch (interswitch) or your bank where you are told that you need to provide your card details; otherwise your card will no longer function.
Your suggestion is probably correct. I have received horde of emails from the so-called Interswitch Nigeria on the need to re-activate my ATM card on-line. In the last couple of days, I receive about 4 to 5 mails a day with a warning that this is my last chance. Interesting enough, the mails are signed by Interswitch Nigeria- no personal names or official designation. I am surprised that people will fall for such tricks. Customers get ATM cards from their banks and not from the so-called Interswitch Nigeria.
It is only fair that whoever has problems with his/her ATM cards should deal directly with his/her bank and in person.
There are other ways by which PINs can be fraudlently obtained. A lot has been written on these techniques. Our banks also need to improve on security and privacy for ATM transactions. A situation whereby people mill around an ATM machine and can easily sight PINs used by others is a security risk.