I had these on my contract when it was about 1/2 way through.. Tried contacted Vodafone but they = useless.
Also tried texting 'STOP' and things like that, but end up getting charged 1.50 for the 'STOP' messages aswell!!
Luckily they only lasted about 3 weeks and i haven't had any bother since...
There was a guy on 'Tonight with Trevor Mcdonald' who made 7million quid in 5 years doing this to customers...
And the phone companies do
FUCK ALL about him!
And he lives in a fuck off great 10 bedroom place in Surrey...
Makes you spit!