Yansee. My late FIL fell victim to these scams and had sent them a total of £8,000 before we found out what he was doing. We tried to reason with him but in the end, we had to take his cheque book away from him.
We kept it for a year and when we gave it back to him, thinking he had understood that all they wanted was his money, he started up again.
It's a very real problem.