Builders Warehouse - Poor customer service

On the 9/08/22 I went to Builders in Thabong to exchange my magneto Solar home lighting system only to find out they don't have stock available so they said I must come back after a week so on the 16/08/22 I went back again only to find out they still do not have stock so I decided they must refund me because my mother needs that light urgently but most unfortunately the cashier Kgomotso Motsage took her time to go ask if they can be able help me exchange it, when she got back she just told me they won't be able to refund it because I bought that light in Vosloorus but funny enough last week on 9/08/22 I went to the same shop & Lebohang Mosutho helped me with a refund because they did not have what I wanted in stock for exchange. I am not happy as your customer what that lady did just made so sad. My concern is if someone brought me something in Vosloorus I must go back there while there are still the same shops around.