I AM ****ED

So, I am in store buying a gas stove and ceiling fan. While waiting for the stove we have a look at the coffee machines. I notice R500 off the Nestle Dolce Gusto, and call a staff member to confirm. He explains that you get R500 off the price of R1999. I asked him if I could return for it tomorrow, as I didn't want to swipe two different cards (daily limits etc), and he assured me that it would be fine and at that discounted price. Pay for the stove etc and leave. Return the next day, and the R500 off sign is removed... I call someone (think her name is Zanele) and she explains that its for the first 500 customers bla bla bla. THATS NOT WHAT I WAS TOLD! I specifically asked if i could get it at the lower price the next day, and i was told YES! So, anyway, Zanele calls who i assume is her manager, and he tells me that he will see if her can get more vouchers. Long story short, i left my details after purchasing at R1999 and have not been contacted back! I want my R500 off as promised on day one, I cannot wait 2 weeks for a single reply!