Advert on my phone

[Minge]

  driving me mental 

Bought a lara croft game from the play store, but it's also installed an amazon advertisement that pops up every 5 mins , even after uninstalling the game, clearing cookies etc... Resetting the phone, the fucking thing is still on 
It's got an 'opt out' option on it, but that dosnt work either.
Gunna fling the fucking thing soon