Might pay to check your data usage over the last couple of months. Vodafone were advertising a "Watch For Free" mobile youtube service that actually incurred data use charges. My partner and I have just fought them over the last couple of days and have both had full refunds.
They have now removed the link but I have a image of the wording.

Vodafone came to this conclusion... "After some investigating, I agree with you that it is misleading when it states "Watch For Free". With this in mind, I have credited your account with an additional $XXXX incl GST...."
It was very hard to convince them but they did the right thing in the end.
Good luck,
MrWomat