This one na old pattern odf scam, because me I still see am, like the same scam wey person go call you tell you sayhim dey call from your bank make you give am your last 4 digits pin for your ATM card, say if not the bank go block your ATM card, and you wey no understand say Bank no dey call customers for such issue, you go fall mugu for them, and them go wipe out your account. We need not to believe or put mind for free things because all of them na scam.