Owe me refund due to duplicate transaction!

Im not here to fault Makro products or their delivery services! What I am ANGRY about is the fact that they owe me money and to date I am still waiting on my refund! On the 20th February I used their app to place an order. Use the eft option and according to the app my transaction was “unsuccessful “ so I attempted to pay again. Long story short I landed up paying TWICE for groceries. I immediately called makro to let them know. Was told to email proof of payment etc. Did all I was told. I also notified them via social media on X. I have since received a call asking what refund I’m referring to! I explained the whole story again. It’s been TWO weeks and I have had no response from the social media team or via email! I am FURIOUS!! Makro owes me R 517.75. I was told it takes 2-5 working days! It’s definitely more that 10 working days now!