Misleading information

I went to burger King in Rosebank.i wanted to redeem my coupons.i didn't know that fnb has it's own menu which defers from burger king.to my surprise.the same menu that I bought with fnb coupons was double amount than the one I would have bought straight from burger king.and the treatment i got was so grossly.i was told the machine that was making I've cream and shame was not working as i was waiting for my order which was way expensive.a client bought an ice cream and he was given it.i call the man who was serving me and told him what I just saw.he said no it's working now.this is so discriminating and bad.i don't even trust fnb.