A small poster in apartment lifts on spotting fake calls

In city apartment buildings, older residents are often alone. When a call comes in the name of a bank or office, they panic and give out the OTP. A few young residents make a one-page poster with only four lines: never share an OTP, be more careful when rushed, hang up and visit the bank yourself if in doubt, and call 999 if you sense danger. Put it in the lift and on the ground-floor notice board. Every three months add a fresh example. You need the building committee's permission, a few sheets of paper, and large, plain Bangla.