Originally Posted by
Just_Me_D Since I don’t know your web surfing habits or know what apps or services you’ve given calendar access to, I recommend you restore your iPhone and then set it up as a new device. I’d also keep close watch over app, service and website permissions.
I am usually a very careful user. I try not to visit websites whose URL seems suspicious or if a website does not have a https(I know these alone are not helpful) but recently I opened a free movie website to stream a movie and such websites usually lead users to several ads before playing a movie and at that time I encountered an ad which was related to the security of a phone. After that I have started getting those invites. Now, I do-not really know if it was that ad or something else as I usually use such websites to watch movies( which probably is not okay) as such a thing has never happened before.
Also thank you for being helpful!