Comment by TheFreim

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 solid, but it tells you to not respond to their own legitimate calls)!