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That is a SCAM message. Don't call them. Follow the steps below to remove that message.
Press the Home button and this will close Safari. Or turn off your iPhone and turn it back on.
Then without opening Safari, open Settings app, select Safari. Tap Clear History and Website data button. Press home button to close that screen. That should remove the scam message. You can now open Safari without getting that message.
If you have any questions or would like any additional information, please don't hesitate to ask.
Hi there, I'm just checking. How is it going ?