Persistent pop up?

I keep getting a pop up survey on my iPad from Orange offering a new iPhone for one euro! It is driving be crazy because I have to keep clearing cache to remove it :face_with_symbols_over_mouth:
Anybody else having this problem, how can I stop it please?

Pop up blocker?

Already on.

One just popped up from La Poste also want to give me a new phone :face_with_symbols_over_mouth::face_with_symbols_over_mouth:

Buy a better one!