#102 Long Distance
If you suspect you are a victim of a tech support scammer, you see a suspicious pop-up, or get an unsolicited tech support email, you can make a complaint to the Federal Trade Commission by following this link, or by contacting the company that the call center was impersonating directly.
Microsoft fraud report page
Apple fraud report page
Microsoft did a global survey of tech support scams in 2016, and the results are pretty interesting. You can find it here.
Oh, and don't be like Alex. Never let some stranger remotely connect to your computer.