Nasty service

I bought clothes online using the Mr Price app, I paid with ozow instant eft payment. The payment went through my account but I didd't get a confirmation email for my order which contains order number. I couldn't trace the order online because the app frozen. I phoned the customer care, used Whatsap chat which is very useless, misguiding and I called online agents regarding the issue. All they concerned about is that I need to send them pop that has a reference. I explained to them several times that I don't have pop that they want and I can a bank statement that indicates the payment was made. I also asked them to check with the finance department if the funds reflects in the bank. They rejected the suggestion claiming that they receiving many payments per day. They were so lazy to check it for me, I have never experienced such a very very bad customer service in my life.