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That is SCAM. Do not pay them. I will help you to remove it. Are you using or seeing this on Safari ?
Are you seeing this message on Safari ?
If you are using Safari, then follow the steps below to remove that SCAM.
Press Command, Option and Esc keys and this will bring Force Quit window. Select Safari and click Force Quit. This will close Safari.
Then hold down Shift key on your keyboard and open Safari. Click on Safari menu and select Clear History and Website Data. On the dropdown next to Clear, select All History and click Clear History.
(If you see Reset Safari instead of Clear History and Website Data, click it and Reset Safari after selecting all options)
That will remove it.
If you have any questions or would like any additional information, please don't hesitate to ask.