H Iris
I am Dave, an Independent Advisor, I will help you with this . . .
Community is just a user to user forum, we are not Microsoft Employees
The only way you can be sure that person works for Microsoft is if you contacted Microsoft support using one of the global support numbers
If that is not how contact was made, or if they contacted you by phone, Email or in a web browser, then that is a scam and they are not Microsoft Employees
Please provide more information on how contact was made . . .