Worst service from Debonairs and their customer care (Case number 680186)

On the 18th of June 2019 @18:58 I bought a large triple decker pizza @Soshanguve Thorn Tree. To my surprise the pizza was flat and it had no meat inside, took it back to the shop and told the assistant to check it. She went to the back to check with the people who prepared it, before she could come back, the manager was there and said that is how they make it and they won't exchange it for me. I then told her to give me back my money and I will leave the pizza. She said there is no money back and she said probably its the first time I buy the pizza. I left the pizza there and told her I am going to complain about this, and she said go ahead. I then laid a complaint to the customer care on the 18th of June 2019. I received a n sms with a case number 680186 on the 19th of June 2019. A few days later I called in and gave them the case number, and was told that the manager will be in contact with me soon. Since them I have been going up and down with them (customer services) telling me that the manager will contact me. It's almost a month now with no response. All I want is my refund as I did not take their pizza.