Receive this message on my Iphone :Critical Security Warning! Your System is infected with a malicious adward attack. Please contact tech support at 1-844-635-2914

while navigate on google through safari from my IPHONE to find a a card anniversary site , I click on 247pcsupportsquard.com and a message pop up

Critical Security Warning! Your System is infected with a malicious adward attack. Please contact tech support at 1-844-635-2914

I try to call the number but it was an indian voice respond window support center , so I suspect they are hacker so I hangup immediatelly

I was not able to get ride of this message , I try to close Safari but the message was stil there , finally I put my Iphone on air mode and I turn if off after and the message is disappeared

Does my Iphone is secure now ? is there a way to delete historical information from Safari Iphone ?

What I need to do more to ensure that my personnal infromation have not been gathered by those hackers