Bad service

Yesterday on the 05th I made an online order for crammed decker at debonairs Fingoland Mall, got there my order hasn't been prepared so I figured they being cautious cause sometimes customers might not xollect and the order was not paid for so I understood that but I expected them to make a priority since it was ordered online after 20 minutes my order was not done got up and asked how far it was and they looked and they gave me a pizza which didn't have onion, mushrooms. So I asked one of the stuff if they had mushrooms in stock maybe they forgot to mention since it was an online order and she answer yes they do have so i asked if they are aware that my pizza didn't have and I was asked to being and they made a fresh one, another 20 minutes and when I finally got my order I just wanted to go co I also had to wait for my steers order and I got home and I realized I didn't get the cool drink that comes with the pizza, so I got there this morning and the cashier says she remembers me but she doesn't have knowledge of what I'm talking about since she didn't hand out the orders, okay fair enough I asked her to call the lady who attended my complaint yesterday, she went to the back and after 4 minutes of talking to someone she comes back saying no one is there to help me I must come back some other time, I'm at work and I was told to wait till she comes back, I spent 200 for a pizza I don't understand why I would falsely claim for something that's worth 20 bucks, serviced sucks and I regret buying from that branch