Charged for something I never asked for

I went to Debonairs Maponya yesterday on the 25th Feb 2015, around 17:00. I asked for the Subs, one Chicken Tikka, one was Something Meaty. The cashier that is serving me asks the following question : ' Do you want your order with Single, Double or Tripple Cheese?' I say to him , ' just make it single. To my shock when I go back to collect my order its got R14.00 extra on the bill. I ask him why are they charging him for something I didn't ask him for. He says to me no you asked for your Subs with Single cheese, I say Yes, but is it not supposed to have cheese anyway? Then he says no its additional. I said I never asked for that. My problem is that he never gave me an option for ' plain sub, he just gave me the option for Single, double or triple cheese. That is very deceiving and misleading to a customer as I felt I was never given an option to get the plain one, that was not explained to me, neither was the extra charge on my bill. I paid for it and left, but feel very deceived and actually thinking about not supporting the franchise anymore. Honesty is key. I have the receipt should you need it, Somebody please contact me regarding this. Very unhappy