First, you will need to make sure you have a backup of any important data you care about saving to an external hard drive.
Now you will want to perform a factory reset of the Windows operating system to ensure there are no malicious programs running from these tech companies. Tap or click here to see how to perform a factory reset of Windows 10.
Once you have your computer up and running again with the latest updates, you will want to install your favorite antivirus software, we recommend TotalAV.
From there on out we recommend getkimshelp.com for any further remote support that you might need.
After doing these things you can rest assured your computer is safe and protected.
Regarding the company you spoke of, this does sound like they are taking advantage of people.