If anyone receives a call from someone saying they are with Microsoft and that they have been seeing issues with your pc and will help you to clear errors please hang up IMMEDIATELY.
Do not allow someone to repair your pc if you have not contacted them about a issue. This is a scam. And will damage your pc.
Microsoft or any other company will not see issues with your pc remotely. They do not have the time or manpower to watch every pc in the world for issues. Plus that would be invasion of privacy.
DO NOT FALL FOR THIS.
If you have, immediately contact your bank or credit card to stop payment.