That's a different problem. If you called up to reschedule a flight then your booking is no longer in the Self Serve channel, and anything else connected with the flight (apart from things like seats and meals) will require further manual construction by Contact Centre staff. As a result you won't see any POUGs from that point on, but you will be OK for AUPs at the airport. Had you managed to get the App to rebook fully for you then POUGs are still OK, and you probably get a Blue Peter badge for getting BA's IT to work for you too. POUGs can only be offered via Self Serve and the Contact Centre can't do anything to help in getting an offer to you. Well, perhaps cancelling and refunding the whole booking and starting again with a new booking I suppose.