According to Stuff.co.nz:
A Vodafone spokesperson says that Vodafone will neither confirm nor deny stories of such a disagreement. [Business Day]Apple advised Vodafone to change pricing for the iPhone 4 shortly before it was due to hit shop shelves, but an angry Vodafone threatened to can the launch entirely, according to a source.It is understood Vodafone's head office in Britain then intervened, demanding its local subsidiary proceed.