Alert with a pop up is saying to call

On Safari, 2 pop up screens saying Alert Apple System partially damaged and to immediately call 1-855-724-9651.  Small pop up also indicates to contact the same number and also http//techsupportnumber.us.   Obviously fake malware but screens are frozen and restarting won't solve issue.  What can bee done.

Some of those scam pages can be dismissed very easily. Press command-W to close the tab or window. A huge box will pop up. Press the return key and both the box and the page will close. If that doesn't happen, continue.
From the Safari menu bar, select
          Safari ▹ Preferences... ▹ Security
and uncheck the box marked Enable JavaScript. Leave the preferences dialog open.
Close the malicious window or tab.
Re-enable JavaScript and close the preferences dialog.
If the Preferences menu item is grayed out, quit Safari. Force quit if necessary. Relaunch it by holding down the shift key and clicking its icon in the Dock. From the menu bar, select
          Safari ▹ Preferences... ▹ Privacy ▹ Remove All Website Data
to get rid of any cookies or other data left by the server. Open your Downloads folder and delete anything you don't recognize.

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