Day light ******s

In may 2017 24th, i went to their store in Johannesburg to purchase couches, when i got there I liked a few other items, I made a purchase but did not pay sale price in full because i I had reached a daily limit on my purchase, so came back the next day to find Deon the sales guy not available. I left and came back, when I was there I told them I now only want only one item on what I bought. They called and asked if they had stock and yes they did but could not finalise the purchase again because deon was not there, now I call them and tell to refund me as I no longer want the goods. They tell me they are going to charge me 10% of sale total and I do not understand why as it is not my fault that the sale did not go through. I want all the money i paid in full. They should have made sure they help instead of pointing and telling me to wait for this deon guy whom is now not Even working there.