Did it install something? If not, reinstalling the browser you used might fix it.

Remove sim. Do a factory reset to default settings. Reinsert sim. Load up apps you want.

Ps I've had the play store hanging issue. My workaround is to delete all data on the phone via settings for play store and play services. Restart the phone start play store. It'll say something like rebuilding database which takes a while but after that it was OK for me

It looks as if this is going to need professional attention, and quickly because you don't know what else this malicious software is doing, or how it's using your phone to spread it to others.

I would first notify all my regular contacts - family and friends - of the problem, stop using the phone as a matter of course immediately and take it to a specialist dealer, though none may be available at present.

At best I would turn it on ONLY to make ONLY telephone calls or brief texts, and use it for the Internet only in very limited ways and only when absolutely necessary; and NO e-mails!

Though it's easy for me to say as use land-line telephone, broadband PC and a simple PAYG portable, but if it was my only means of communication I realise that could cause other problems.

In the last resort it may mean a new account and number.

Ah damn, you'll have to reset it to factory settings to get rid of it

Follow the advice of everyone who's recommending you do a factory reset, and stop trying to watch movies for free, there's a catch, and you're just finding our what that is.

You need a vpn create sites like this that is movie sites like this require the use of a vpn

Any login credentials you have stored on your phone need to be updated after you reset you phone. and if you do not have MFA on your accounts then you need to get it setup.

Also if you are going to use 123movies or a similar site, use a burner device.

Go to your browser settings and you should be able to remove it

Can you restart the phone?

Dead ahead Zombie Warfare ... Ignore or Remove? 🤣 Lol