i dont think there is another way my friend
you can contact an agent if you wish though
https://giffgaff.com/support/ask
they are usually pretty quick but remember an agent can take up to 24 hours to reply
have a nice day
Vodafone lift the adult content with a Credit card! Then once lifted you can switch it on and off yourself.
Giffgaff are a little too strict in my opinion, but it's their policy; Suppose a personal communication with an agent may get you somewhere, no harm in trying.