Dishonesty and overcharging without notification

I placed an order for food with Steers in Grosvenor Crossing online. My total order came to R69.90 then when you include delivery it comes to R84.90. When the food eventually came after an hour and couple of minutes cold as hell. the total is now R87.90. I ordered a can and they decide upon themselves to give me a buddy and charge me extra for it without informing me as a customer. Steers service is pathetic. I am closing the online account that I opened with them. It is not worth it. As you get your food cold and the chips hard as ever.