I requested my PAC from Vodafone two days ago and was told it would take up to 5 days to post out. I just phoned again after reading this on the OFCOM site: "Your current Service Provider must give you a PAC or a reason why it cannot be issued within 2 working days of your request."
Change your details in My Vodafone. My Vodafone app. You can only change your account PIN in the app: Go to Settings, then App, then Login options;
QTMir.