Malicious Website - mac-issue-online.com and Telephone Number - 1 800-656-8559

I called, they asked me for the serial number of my computer, I gave it. What they can do with that?

Nothing. Just never allow a stranger who contacts you via telephone, email or by other means, remote access to your computer.
With remote access, the cyber-criminals can steal your personal information, usernames, passwords and other sensitive information on your computer without you knowing.

The same thing happened to me today - I granted them access and they wanted $300 to fix the problem, which I didn't provide because I later got suspicious.
In a panic, I did call the number like an idiot. I feel like such a fool. I immediately added fraud alert to my credit files.

I didn't fall into the trap, however, I believe something happened because my work email is no longer letting me login.
Unfortunately, my work email is on my phone and my phone was comnected to my computer at the time that this happened.
I'm hoping for the best and I hope they didn't access anything.

I fell prey to them also, gave them access to my computer did not, realize until they started doing some diagnostics on it and the phone went dead and tried calling back no answer. I closed everything, restarted computer and called Apple and they walked me thru process of checking my Mac. Luckily nothing was done to my computer by scammers.

How to regain control of safari and delete pop up:
1) Force Quit safari program (Click apple in corner and scroll down to force quit)
2) Turn off wifi or unplug network connection.
3) Hold down the Shift Key and open safari at the same time.
4) clear current history.

Thank you very very much!

Thank you so much!

Thank you.. I am so glad I seach the number before calling

Do you know how to clear it from an ipad version of safari?

This had just happened to me half an hour ago, you can go to "Settings" then "Safari" and clear all history and web data.