"PC Support Scam number.
I was not called by this number - I called this number on 11 March 2017 because I received a popup on my PC saying this:
"** YOUR COMPUTER HAS BEEN BLOCKED **
Error # 268D3
Please call us immediately at: 09-888-9002
Do not ignore this critical alert.
If you close this page, your computer access will be disabled to prevent further damage to our network.
Your computer has alerted us that it has been infected with a virus and spyware. The following information is being stolen...
> Facebook Login
> Credit Card Details
> Email Account Login
> Photos stored on this computer
You must contact us immediately so that our engineers can walk you through the removal process over the phone. Please call us within the next 5 minutes to prevent your computer from being disabled.
Toll Free: 09-888-9002"
Firstly, that's not a "Toll Free" number.
If you Google for "Error # 268D3" you can read all about this scam. When I dialed it the person (who sounded and admitted to being Indian) said they were in Washington working for "ITN (Information Technology Network) Private Ltd", but Vodafone told me the number terminates in Thailand.
Do NOT allow these people to connect to your computer (i.e. remote controlling it) even if they say they won't charge for anything (as happened in this case), because that's when they can really load some malicious software (key loggers, etc) onto your PC, and you may not even see it happening."