FOOLING CLIENTS WITH MISGUIDED ADVERTISING!!!!

I ordered 4 box meals for my colleges and myself because the add said 40% off all Box meals. I ordered the 4 box meals which accumulated to R400. 40% off R400 is R100, however they only discounted the one box meal. So I landed up paying extra for my colleges meals as they sent me the money in advance. The advertising so deceiving! NOWHERE does it say one per order/customer. If this is how you want to fool your clients and misguide them then I will never order from you guys again! I phoned to log a complaint and the customer service advisor was not helping or taking my plea into consideration at all.