STERNS REFUSE TO REFUND

My husband bought a ring for me at Sterns Wonderpark Sterns on. 09 January 2018. I did not like the ring and went to exchange it, the following day at Brits Sterns. At Brits Sterns I did not like anything from the shop and requested a refund, unfortunately the assistant told me that they currently don't have enough cash, I must wait in the shop until some1 comes pay with cash, otherwise, I can wait until month end when they have cash in the shop. I the refused to wait for them to have cash I was not sure how long Im gonna wait until someone comes to buy with a cash R2200.00. The I decided to go to Wonderpark Sterns where the original sale happened, when I got there, they told me that unfortunately they cannot refund us, they can only give us a gift voucher. I refused to take a gift voucher then a sales personal convinced to take another ring. I bought a ring, and cleaning water that is used to clean the ring. when I got home, after a day or two, the ring started to change colour and became brown inside. I tried to clean it with the water I purchased from Sterns and it didn't work. I call Sterns Wonderpark and they told me to bring back the ring so that they can clean it for me. I went the and the cleaning didn't work. They kept the ring and said they are taking it for cleaning and will contact me when its back. they called me last week (after almost a month) to come and collect the ring. Im no longer interested in their rings and I want my MONEY back, not a Voucher, I did not pay them with a voucher, I paid with cash. what will I do/buy with a R2000 voucher that I can only use at Sterns. I don't trust sterns anymore, I don't see myself buying anything from the anymore. I need that to give back my money. kind regards Lebogang Sekgothe ********** 641