This guy, 09124902399 will share his contact as the official WhatsApp Number on Facebook when people make complaints.
He will keep faking the conversation by apologizing for whatever complaint you have, when you eventually chat the number on WhatsApp, pretending to be from FirstBank. The end game is to demand your ATM details as the way to solve the problem. See the screenshot below:
Nobody will demand your sensitive bank or atm card details when there is any bank issue. Beware! Don’t fall for such scams. Look for the official and verified channels and make your compalints.