I've got a billing dispute with Vodafone. They are jokers.
I've had a Vodafone account active since February, at which point I also added a bundle for 300 minutes to 08 numbers. On my recent bill, I have been charged over £30 for calls to an 0870 number, even though the summary clearly shows that I have only used 205 out of the 300 minutes. In all, I was billed for 66 minutes of "out of bundle" usage for such calls.
When I first approached Vodafone about the problem, they said they would contact their "leakage" team to get them to refund. What I didn't expect was for the "leakage" team to refuse to refund the charges, as the 0870 number in question is a call-through number. They are now claiming that the charge levied for the call to the 0870 number is in fact a charge for the onward call to the final destination.
I've now sent a written complaint (via Special Delivery) so they can't pretend not to get it. I've also promised that the case will go to the Ombudsman if it's not resolved to my satisfaction (including a good will gesture).
I really very very strongly advise people to steer clear of Vodafone at the moment. If you're already with them, then check your bills carefully.