How do I get rid of vungle on my iPhone? It is NOT an app.

something called Vungle installed itself on my iPhone when I watched a commercial while using the Yahtzee app. It isn’t listed in the apps section of my iPhone’s settings. I see it when my screen locks and it displays vungle like it’s A song that’s playing or something. I think it came from a commercial because some commercials on the Yahtzee app don’t play,… they just have a blank screen… and when you click the X to exit the blank screen it shows it is vungle. I don’t know what vungle is exactly, but would like it gone.