Email the Advertising Standards Agency with the following message:
"Please, please, please make the ‘Crazy Frog’ adverts go away and end the nightmare for me and thousands of others. I would more merrily listen to my own teeth being drilled with a rusty screw tip than endure one more repeat of that advert.
"Please, I can’t promise it won’t push me over the edge. Don’t let that forever be on your consciences."
Update: *don’t* do this – the ASA are (somewhat disingenously) interpreting such complaints as being about frequency rather than about content. Send an email pointing out how aesthetically offensive the content is instead…