Europa Art Shoes Shop Menlyn

I was trying to buy shoes today at Menlyn using payjust now. The order went through but the store refused to give me shoes says the payment is not reflecting from their side. Payjust now even sent them proof for transactions. I called them they are still refusing to assist me. The assistant Manager there was very rude and refused to reason with me. Can I please get help with this R3 000 is a lot of money to pay without shoes. I have showed them the proof and payjust now sent them as well. But still no help. I,need the shoes or refund urgently for my graduation. Order number 1873496.