Sheet street giving me the run around unnecessary

On Saturday 16 August, I brought my un-opened curtain in its original packaging to Sheet street woodmead, I did not have the slip, so the lady said I can take something else to the value, & she cannot give me cash without the slip. She had quite an attitude with me, that I felt some kind of way when I walked out.

Then the whole weekend I searched my garage & went through my trash & finally found the slip. Today morning 18 August, I came back with the slip, this same lady with the attitude now said she does not have cash in the tills. But i saw 1 of their staff behind the tills counting R400+ cash.

This curtain is only R279, & this arrogant lady still refused to refund me the money. She wanted to give me a voucher, I told her I needed the money for something else. She said I must come back after 12 for cash!!! I did nothing wrong as a customer, I brought the original item unopened in its packaging with the slip, still i had to walk out the shop once again with my curtains unrefunded because of this same arrogant lady who refused to help even though they very well had the cash.

This run around past few days has caused me to HATE sheet street, I used to buy so many things from sheet street, but never again. The customer service at the woodmead branch is absolutely appalling.