Refund-Defective Product Sale

On the 10th December 2022 I bought a usb-c charging adapter for the iPhone and was not working, the shop assistant gave me option to take another or get a refund, but because of the urgency and I didn't want to risk another failure I took a refund.

The Manager made me feel like an asshole for asking about their refund time lines and said that the store hasn't been making money and that I should calm down and bare with with them. I did now we are in the new year and I have called multiple times and 3 weeks ago I paid the shop a visit, she was unavailable so I left my contact details. Still no communication from the shop nor her. I have bought another adapter and R400 unaccounted for in my business. I don't understand why she or her team members are not contacting me in terms of my purchase. I have now lost proof of my purchase due to moving so they better not use that as excuse because I have the proof of sale on my bank statement.