Advert problem please help!

[Dan_K _]

Hi,i own a Samsung Galaxy S6 Edge and i seem to be having a problem. Whenever i am using my phone no matter what im doing,if its surfing the web,playing games,social media it takes me to an internet page saying "You have one an iphone 6 click here!" or "Click here to win your tesco voucher!" or things like that and i left it for a while thinking it will go but it still does it and it is very annoying,please help me so i can stop this from happening. I have the newest Android Version [5.1.1] and i stopped cookies and i also have a couple anti virus apps such as clean master etc.Please help!!