Side-stepping FOOTGEAR HILLFOX !!!! Bad service

So today I was at Footgear Hillfox branch in the Westrand where I was wanting to exchange my son's Sneakers for a more fitting size trouble was I had misplaced the receipt but the shoes and box were still intact. I approached the sales assistant at the entrance and explained to him my situation. He flat refused to assist and told me that it will impossible to exchange the shoes without the receipt and when I advised him that at Westgate Mall branch they had told me that it's possible to do the exchange the only thing is I will not be issued a slip. He still refused despite me offering to at least show him my bank statement transaction on that particular date. I then headed to Westgate where I was assisted without any hustles and ended up buying 2 more pairs of sneakers. My question is did the other sales assistant not want to help or was he just not interested in me as a customer. I will never set foot at Footgear Hillfox!!!!👣👟