Shockingly bad service delivery

On Friday 13 June I took out a contract via Vodacom online. I was told the device will be delivered to me within 72 hours, granted, Monday was a public holiday, but we are at 19 June now, still no waybill number from the couriers (RAM) when I phoned RAM to enquire about delivery date, I was told they still have not received the order from Vodacom. When I phoned vodacom, they advised me now they do not have stock on the selected device, after the agent confirmed on Friday they have stock. I need to cancel this contract immediately so I can go in store and do things myself. Please contact me so I can do the cancellation.