Vodacom is ******** customers via VodaBucks Store

I bought two Smeg items via the VodaBucks store two weeks ago and I received SMSes confirming my order, saying it will be delivered within 5-7 working days. It's been two weeks now, I called customer care to track the status of my delivery and I'm told they are out of stock. My question is, why did Vodacom accept more orders while they know they did not have stock? and again why are they not keeping customers informed about this issue, I waited 7 days and no communication to inform me that there's no stock. This is a ****** ****.