Bad attitude and Pricing Problem

I am currently due for an upgrade on my cellphone contract,so on Tuesday 16 June i went in to the Vodacom in Watercrest Mall and inquired about an upgrade.After seeing the advert outside the store for the particular phone i was interested in,i went in with every intention of getting that contract but while in store i saw the same phone for the exact same price but with more airtime.So i said i wanted this i was told that in fact this promotion was over and it is more expensive now.But on the instore promotion that i might add was sitting right next to the phone there was absolutely no date of any kind that would indicate when it had expired. as i was told it apparently expired at the end of the last promotion period which would have been 7 June.Why was it still shown st that price.when i asked to talk to the manager i was told by the staff member that there is nothing anyone can do and thats that and while i was talking to him he just starts walking away from me.I only wish i had got his name because that is not customer service.i proceeded to ask for the manager to phone me and was assured she would the next day,as of yet i have had no response.its like Vodacom dont want business