My grandmother was 76 years old, but her age had absolutely no impact on her mind or sharpness. In the past, she was an accountant with many years of experience, and even in retirement, she kept her head cool and her mind clear. 

One day, fraudsters tried to scam her, but they didn’t know who they were dealing with. My grandmother taught them a hard lesson they will remember for a long time.

Here’s what she did  The continuation in the first comment 

One day, my grandmother received a phone call supposedly from the bank. A young, polite voice informed her that someone was trying to take out a loan in her name, but the bank employees had noticed “suspicious activity” and were ready to help cancel the transaction.

To do this, she just needed to confirm her identity and provide a few details: her passport number, the bank card number, and the code from the SMS.

— Oh, — said my grandmother, — how good it is that you called. I’ll find the card and give you all the details.

But instead, she took out an old, inactive card and came up with a plan.

First, she slowly dictated made-up details, pretending to be confused. After a couple of minutes, an SMS arrived — the real one, from the actual card the fraudsters were trying to use.

But my grandmother didn’t enter the code. She wrote down the number from which they called her and immediately called the police, explaining everything in detail. Then she called the bank to block the account.

But she didn’t stop there. She told her niece, who works in IT, about the call.

She quickly found out that the calls were coming from a spoofed number and helped track the IP address from which they were trying to access the online bank. My grandmother passed this information to the investigator as well.

A week later, she received a call from the police.

— Thanks to your attentiveness and the information you gathered, we tracked down the fraudster group. Three people have already been arrested, two of them are repeat offenders.

— Well, that’s great, — said my grandmother calmly. — Let them think about their behavior.