Worst service ever - do not use them

Placed order and paid on 29/04/2020 - Zulzi Order Confirmation - Order #229798. Noticed on the app my order is marked cancelled. I have made a payment as per the email I sent 29/04/20 after struggling to understand how to make the payment on your app! I phoned the bank today 30/04/20, they confirmed payment went through to your account and I did not receive my delivery!!!! The bank has advised that the payment needs to be reversed on your side. I think you guys are a bunch of *******. I have read the comments on Facebook and most people seems to have the same problem. Unfortunately for me, I only read the comments after I realised I am being ******. It is insane and how you even get away with this? I have sent emails yesterday, I tried to call too, but you don’t reply. You don't answer your phones as you are working remotely! It should be business as usual. This is the most pathetic services I have ever come across. I have been doing online shopping for years and never experienced such bad service before. The CEO appeared on eNCA news to tell people of their good service and how they've grown and employed more shoppers, now this! It is false advertising! I demand a refund as I did not receive the delivery.