Poor customer's service and Refund

Afternoon, I was at Game Soshanguve Crossing today in the morning, the supervisor Mashadi Mashaya was doing parcel counter, helping ant the tillls and also the returns and Laybyes.i waited 1hour before MrMathews Mashaba came Trolley Speaker that is not working, it starts with high sound and next goes to very low sound. I'm very much disappointed about the service I got there, First Mr Mabasa Mathews send me to music department to check the speaker, then they found out that definitely thers a problem with it. I went back to Money Center ,where I met Ms Mashaya Mashadi who told me that it needs a repair and those people ate closing on the 15th December and will open again 15 January, I got frustrated because I wanted to use yhat speaker for Christmas and New year. I told her that they must refund me do that I can buy another one. She refused saying that the suppliers are the ones who can tell them to refund, I mean as customer I understand thati bought an item and if thers a problem, the shop and the supplier must sort it out., I just wanted a refund to buy another one. Now Mr Mashaba said there's no other way but to send it for repair, i had to sign for it but yoh I'm frustrated , how can you help me.