Worst Customer service ever

Good Day I have had the worst experience ever at the Pick n Pay Express store in Actonville at the BP garage on Liverpool road. I filled petrol at the garage prior to going in to the store to get some drinks for my kids. When I got to the till the manager (a lady) assisted me and it was unfortunate that my card declined, which was strange to me as I just swiped for the petrol before going in. At that point I asked them to just hold on I will just quickly go to the ATM and be back to pay and left my kiddies in the store as assurance and was in my sight. At this point the FNB atm was being serviced or something so I took a bit of time. When I got back the Manager had instructed the ladies to take the slushies away from my kids and throw it away... how disgusting is that and I can only imagine what my kids felt. In any case I continued to pay for the other items and it seemed like the tellers were now refusing to help me even though now I was paying cash. And as for passing remarks to each other in vernacular, really its the new South Africa they shouldn't assume that we DONT understand. To me this is completely and utterly disgusting, and its people like the manager that also give the Islamic community a BAD name. AND do they really think that I would have left my children in the store and driven off without them. To top it all off the we left without the Slushies and crying daughters because now they had to make a new batch and I was not going to wait 30 minutes for it.