This is the advice given to anyone who has any phone calls, etc. like this about Malware, License Expiry, Refunds, etc..
And your machine does not send out messages to anyone saying that it has problems or is infected with Malware, etc.
We all have errors and warnings in our event viewer, which is another ploy they use to scare you
These so-called "Microsoft" Tech Companies either want to sell you worthless software, or gain Remote Access to your Computer to try and steal your Banking and Credit Card details and to also carry out an Identity Theft on you.
As you have given them Remote Access and if you do Internet Banking, contact your Bank, explain it to them and change Passwords.
If you use your Credit Card online, cancel it and get a new one issued to you.
And the only way that you will know that you are free of them is to save your Data and do a clean install of your Operating System.
And if you do not already have your data backed up to external media as you should have done, scan it before you put it back on a new install.
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How to reinstall:
Cheers.