Confused

I have been a Vodacom customer for years and have recently decided to go for another early upgrade. Upgrade was approved for a LG V20 which has been advertised on their recent Booklet. Deal was approved but I received a call the very next day that vodacom does not have any stock. I have seen this type of advertising before but never said anything public. Today I decided to call Vadacom Waterfront just to double check and again was informed that no store has the LG V20 or V30. How is is possible for such a large corporation to spends so much on adverting a product just to inform the end user that "Sorry, we out of stock". This not not totally unacceptable but very frustrating.

Right now I am deciding on weather its worth remaining with Vadacom or moving to another provider once my contract ends.