Can't get pop-up ads off a Samsung A20

My Aunt has a Samsung A20, she’s not sure what she did or what she may have downloaded but she now has pop-up ads that come on her phone every time she does anything on her phone. She had deleted most apps on her phone. I’ve cleared her cache. It seems to possibly be coming from her internet. I installed norton on her phone. It scans and says everything is fine but the ads didn’t stop. I’ve included a couple of screenshots. Any help is greatly

It would be helpful if you could get a screenshot of one of these popups.

Which cache did you clear? There is a cache for almost every app on an Android device.

Install and run a free second opinion scan with the Malwarebytes app.

Try installing an ad blocker app on her phone.