This article from Lifewire explains what Tech Support scams are typically about, and also what you should do if you get caught out.
“How to recognize tech support scams and protect yourself”
My Tech Support Scambait Adventure
When a Technical Support scammer called me, late in the day, right when I was not in the mood for more lies… I felt a responsibility to waste this guy’s time so that he couldn’t instead be stealing from others.
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That Scam Show 