What does it take to get my money back?🤦♀️

I made an online purchase of 3 items on the 15th of November 2021, but I only received 2. The one I did not receive I was told the delivery vehicle was hijacked and I was going to receive my refund within 10 business days. Since then, I have called the TFG call center so many times trying to get my refund but still to this day, 24 January 2022, I have not received my refund. Every time I call I keep getting promised my refund is being processed, or someone will call me back - which never happens. I have all the emails as proof of communication with the store, which has led to nothing to this day.