Yellow Sub Trading don't want to refund me my R460 back! I want my money!

I made an order on the 21st of December 2022 which amounted to R2285, on the 22nd of December 2022, I received a call from yellow sub trading to tell me a certain item was not available, which I also asked for them to remove the shoes I had ordered as well, of which the order amount went down to R1825. I have written numerous emails and whatsapp text enquiring about my refund of the outstanding R460 and have still not received any response