Say "if it's important send me a letter". Hang up. Don't waste your time running round after these idiots.
A letter can be discussed with friends and family. It's much easier to dismiss without a con artist whispering in your ear.
It was “Synchrony Bank,” telling her she was victim of a fraud. I contacted the real Synchrony Bank, and let them know about the fraud. The contacts stopped.
But but it'll filter out most of such scams which are "online-only".