Strange noises from iPhone

My iPhone has started to make random noises, some of which are beeping noises or a lady speaking about winning an prize. I swiped up and looked at where music usually comes on in control center and it shows that a website is playing the sounds even though I don't have safari up. The sounds bypass my volume and mute settings and I don't know what to do. I've looked around and people who have had similar issues say it's because they jailbreak their phone but I haven't done any of those modifications.