Terrible service for online purchases

Ordered a slatted divider door online on 8th August. I received a confirmation email and confirmation of payment along with an order number. Days later when I tried to track my order I found that the order number did not exist. Called the call centre on the morning of the 15th August and spoke to Courtney who said she has to resubmit the order and it will start over from scratch. She will find out what went wrong from the I. T dept and get back to me. She did not. On the morning of the 16th August I called again and spoke to Ashley and she said that my order number was now traceable. I asked if there was any feedback with regards to my query and if I could speak to a supervisor to see the delivery can be fast tracked since the fault was on their side and I needed the door urgently. She said that she can't do anything because it was Courtney's case and she will tell her to contact me and to see if she can ask the courier to expedite the delivery. I have heard nothing from them yet again. What terrible customer service! I have to waste my airtime to run after them!!!!