Failure to deliver SARS-compliant Invoices - Terrible Service from Customer Service

I have been trying to obtain SARS-compliant invoices from OneCart to no avail. When I requested the invoices for my purchases, the "Customer Happiness Team" member that assisted me sent a non-branded, not SARS-compliant basic chart to me. I then explained that the document he sent was not valid and he would need to request the invoices from the Accounts Department that was official. I was very clear and said that I needed tax invoices for my purchases made from August to date, as it is my right as a paying customer to keep these in record for SARS. The gentleman then proceeds to send me 1 invoice only, for my last order. Upon enquiring where the rest of the invoices are, his response was "I sent you an invoice based on the order number you provided. Kind Regards, Jabulisile, OneCart Customer Success Team". This is basically a clear refusal to assist. Not only did he not read my original enquiry properly, but he has now received a follow-up on the request and he continues to dismis it. I have requested to escalate this matter to his supervisor, but I am here to warn other customers from potentially experiencing something similar. I don't think OneCart has proper Admin processes in place and some of the "Customer Success Team" members must definitely go back to training. This, unfortunately, has not been my only negative experience with OneCart, which is why I have stopped supporting their business the way I used to.