I'm sure you've all had a call at some point from someone claiming to have detected a problem with your computer and offering fix it remotely for you. These are calls from BAD PEOPLE that want to install malware on your PC and steal your card and bank details!
Had one today, so did my public duty to keep him busy for as long as possible so it he'd be wasting his phone bill and more importantly, not be getting any victims in that time.
Managed to keep him talking for 45 minutes while I pretended to do everything he asked on my computer and faked various problems, which required walking the "long" route between the computer and the modem to reset it and well I am getting on a bit and my back hurts so I do tend to walk a bit slow, but fortunately "Chris" (odd for an Indian name) was very patient, especially when the laptop shut down because it needed the power cable which took a bit of finding!
Anyway, the sequence seemed to for installing a remote access client on the PC so that they could control it, the cheeky buggers.
After my internet connection "wouldn't connect" I got his phone number so I could call him back (I won't) and he said he would call me again another time - when I'll waste a bit more of his time

So if you do get one of these calls, please consider keeping them busy, you're doing someone else a favour by doing so.