Worst online ordering system!

Friday: I placed an order on Volpes' website for curtains - according to their website they have stock of everything I'm looking for. Did an EFT payment through their website (SID instant EFT). After payment gone through, I received an order number and they said that they would send me a confirmation email - which I never received. Someone from Volpes then emailed me and said that they saw I tried to place an order online but didn't finished it, and that he/she wants to help me finished it. After I told him/her that I already paid and got an order number, I asked that he give me a confirmation for when I will receive my order. He/she then said that delivery can take up to 5 days. Monday: I emailed the person again asking for confirmation that I will receive my order, because on the website it says that my order have been cancelled. No reply. Tuesday: I went onto the website again, tried the Online Support Zendesk a few times with absolutely no response. I then filled the Contact Us form with problem that I haven't received a confirmation email and that I want to know when I will receive my order. Tried to call the Head Office number on their website as well, which was not available everytime I tried calling (4-5times). Wednesday: Got an email from someone saying they will check stock and revert back to be. Thursday: No response received? I rep**** on her email asking her again when I will receive my order, whereafter she said that someone else will let me know. The other person then emailed me asking what amount I have paid. After I sent her a screenshot of my order number and the amount that was paid, she asked whether I paid with credit card or EFT. After telling her again that I've paid via EFT, she said that she cannot find my payment on their system and that I should send her a proof from my bank. So then I told her that it has been a week since I've placed my order and PAID, I thought that I would receive my order by now but now she is telling me that she can't find my payment on their system! I included my proof of payment and told her that I want my order by Friday afternoon as I need to hang my curtains by Friday night because I will be having guests for the weekend, so she needs to sort this out immediately. She then rep**** and said that she wil check for me. She then mailed me again saying she found my payment and that my order will be dispatched the same day. I then asked for the 5th time WHEN I will receive my order and she said on the latest Monday. I then told her that she need to tell the courier to have my order delivered by the end of business on Friday. She said she'll see what she can do. Friday: At 12:30pm I received an email saying that they were out of stock so they will send my order out today and I will only receive it on Monday.

How should I leave my guests with no curtains? I order on Friday, delivery is supposed to be 4 to 5 business days, now I'll only receive my order 11 days after I've placed my order and paid!