well they seem to have changed their minds , their first response from vodafonedirectorsoffice@gb... said i could not cancel.

I replied saying i was not happy - and offered an analogy that if a Vodafone supplier changed their T&Cs which ended up costing Vodafone more money they would not accept the change and that it was convenient for them to use my previous months bill ( in previous i had exceed 500Mb. )

I'm not sure my analogy won the argument, but i received a 2nd email today from customer.care with a PAC saying i can cancel and keep the equipment. different departments saying different things ?

... GiffGaff Sim on the way, I'm taking this last email as enough to cancel.

Now do i cancel my DD after i transfer the PAC code , then phone VF for a final bill, i guess the worry is that I transfer PAC, which in turn cancels my contract - and then i get a bill for 14*£30