Bad/Poor/Unfair Customer Services

Bad/poor customer service by the Boksburg Branch, Sheron who is the store manager/supervisor she does not want to refund my money. Me and my wife we went to the store to buy a couch, and we paid a deposit of R5000.00 and we were told by the sales person (Khutso) that if we change our mind and don't have take anything, they will take 10% on the deposited amount, that was fine with us. We went back to the store to cancel the sale due to some reasons (personal) and we were told the 10% it's going to be charged on the total value of the purchased item we refused that reason being its not what we were told. According to what we were told, we were going to pay 10% of R5000.00 (deposit) which is equal to R500.00. Sheron told us that the balance of the 10% will be taken out from the sales person (Khutso), meaning R500.00 we pay then sales person the balance of the Purchase Price (R16388.00). We tried to be understanding and came to the agreement we will pay half of the 10% purchase price and sales person half as we were not told correct information. Breaking it 10% of R16388 equals 1638.80. we pay R819.40 and sales person pay R819.40. We were trying to be understanding and Sheron promise to refund us within 7 days from 24th September 2018, but up till now we haven't received the money, and when we called yesterday Sheron told us no they will take everything from us as its sales person word against ours. But funny she didn't pay the us anything and she told us she was busy the whole time. Please kindly assist me regarding this poor bad unfair service.