So called online error

I got a promotion on the vodapay app to get 3x all in one feast and a coke for R7. 95 I received my confirmation of order via email I call KFC golden walk they don't anything about it said they will call me back which they did only to tell me it was a error like really now he told me to call customer care which I did and a rude lady told me the same thing so why did I get a confirmation email order number reference number is Brigett*** is this the service you get from KFC