Vodacom upgrade always issues

I upgraded yesterday to a double-up deal Vodacom advertised. Just to get a confirmation that the deal was advertised in error and that I must choose another deal. The representative gave me Ts & Cs which are at the bottom of their website which gives them sole discretion to revise, refuse, or cancel online orders as they please. I've contacted them multiple times now to cancel my order as I then need to choose another order. The call centers just tell me that the confirmation dept needs to confirm the order before they can cancel the order, but online the order already shows processed and out for delivery with a RAM waybill number. I can not go forward in choosing another deal or change/cancel my order until they have confirmation but the order is already processed.