See who's calling

A man has called several times saying that he wants to send a 'pain cream' from my Dr. I ask which Dr, he said I 1st need to provide and verify my Medicare account number. He continues to call using a different name, but he has a distinct accent, so no matter what name he gives, it's the same person. It's a scam but I have no way to report it, when I call the number it's not in service.