Refund dispute

Yesterday I was at work, my company is based in Meadowdale. I made an order in the App. I kept trying to change my address to my current location but the app kept sending it back to home address which I saved. I ordered but later realized that it actually sent the order to my home address. 2min later I canceled the order I then received an email stating that Wimpy had already completed my order and the food was ready so meaning they will not give me a refund. I canceled with in 2 or 3min!!!! How did they finish making the food so Damn fast! It’s disgusting honestly