Bad Customer Service

I bought a top at Mr Price Sport at Table Bay Mall on the 25th May 2019. It was for a specific event but I ended up not using the top and realise that I should rather return it and use the money for something I do need. I went to the store on Sunday 16th June 2019. I gave the top and the tag back to the lady behind the counter and showed her my invoice on email. I paid with a debit card, the one and only card I have. It shows on the invoice "credit card", but I showed her my card and she said they will either give me back the cash or give me a refund on my card. On the computer screen it only showed the options "refund on card or voucher". After inserting my card twice into the little card machine, it kept giving us a declined error. She called the manager on duty. Unfortunately I do not know her name. She argued with me that first off all I used a credit card and secondly the top was bought "last month" and therefore they can only give me a voucher. I told her AGAIN, that I do not owe a credit card and that although the top was bought on the 25th of May, I have the right to return an item within 30 working days from purchase with the original invoice, which I did!!! The girl that was helping me from the start, swiped my card on the card machine and it seemed to work. The manager lady said with a terrible attitude that it will not work. There was a queue of people standing behind me at this stage and I the attitude I received was definitely unacceptable and also that both of them were arguing with me about the 30 day return policy and my debit card. I will not return to that shop any time soon, and I will make sure to tell all my friends about the terrible customer service one receive from there.

I am still waiting for my refund, which should take another day or two and if I do not receive it, I will lay a charge of theft.