My bank uses a fraud detection system that calls you if suspicious activity is detected on your account. It then asks you to call back a number to verify the account activity. Every time they call, they provide a different callback number. Searching for the callback number online yields only one result, which is the fraud detection systems web page telling you to NOT trust phone calls of any kind (their advice is sol…
The only time I ever triggered fraud detection system on my card I got a text message from bank that was "Your card is blocked due to suspicious usage, please call 'number'". And the number was also some random unlisted one. Only reason I didn't just ignore the thing is I did make a purchase on new website a half an hour before. Called my local bank and they confirmed this was legit, I almost went off on a full rant…
A few days later I found out the call really was from the bank, and the bank had blocked my account, in a way that took a long time to unblock (don't get me started...). As ever, I found out the hard way, when I needed to use the account for something in real-time and it wasn't available.
But the call was from a different department than general customer support, the department's number wasn't known to customer service, and the account status change wasn't visible to customer service either.
So the bank's own customer service thought it was a scam call!