It's possible to reduce the hassle
A few years back, after I'd started getting more than one a week of these fake PC/IT/Internet support calls (always from someone sounding rather Indian but allegedly called "Mikey" or "Isobel" or somesuch), I started explaining - politely and calmly - that I knew the caller was a criminal fraudster and whatever it was they were after, they weren't going to get it from me. Usually they hang up at this point.
(Sometimes they get threatening, offensive, or abusive in response to my initially polite and calm response - at which point they generally discover that this particular calm, polite, and well spoken middle aged Englishman can be an awful lot more offensive and abusive than them. I make a special effort to maintain a maddeningly calm voice in the process - well, it winds 'em up more.)
The tactic appears to have reduced the frequency of that type of nuisance call by an order of magnitude: it was more than once a week, now it's less than once a month.