Rude and condescending staff member!!!

I visited a Donna store to return a torn dress on 27/12/2017, to my surprise I was told they do not have money and I cannot get a refund at that time, I went back again on 05/01/2018 at 5h30pm and I was assisted by this woman named Iris who was so rude, she told me to rather exchange because they have already closed tills and do not have money, she asked why is it that I bought the garment elsewhere but return to their store. She gave me the worst attitude and told me to come back another time. I went back at 3h30pm on 06/01/2018, the same woman was called to the front and told me it's clear that this money refuses to come back to me because they have closed their tills. She asked me, the customer what she must do; she made the same remark about me chasing after them for a refund when I run to other stores to purchase. One staff member tried to tell her this is not how you speak to a customer and she continued to say what she was saying was true. At that point I was irate because I have been a loyal customer for more than 5 years and have never had issues at this store. I responded to tell her that this was the 3rd time I was coming for a refund and I was not leaving the store without it. After the terrible experience I had with the dress tearing at wedding I had to have such difficulty returning it? I asked who would reimburse me for the transport I used to come there every time. It was at that point that she processed the refund. I wanted to bring to your attention that I will never set foot in that store as long that terrible condescending excuse for an employee is still there. She has no ethics and morals and she know nothing about providing customer service. I used to buy at least 1 item every 2 months from Donna but after this experience I believe that you do not know how to treat your customers with dignity and respect. This experience has altered my view of this brand and the people who represent it. Disgusting!!!!!