I'm sorry about the issue. This is definitely a scam No support company or Microsoft would ever call you for any computer support (you would call them first if you need any computer help.) This is a scam in order to get your money; they are pretending to be from Microsoft company.
Can you contact your bank / credit card company to cancel the charge from them?
Did you let them get on your computer?
What did they ask you to do, if anything?
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