Terrible Service from Truworths online

I placed an online order on the 26th of February and their delivery details on the website states 5 working days. They are now telling me that I will not receive the items ordered by the 4 March as per the own specified delivery times. In fact, they never actioned the order until I phoned on Monday....it was only after this that they sourced the items and the courier collected them. I have requested that they send the items via overnight delivery for which I will pay but they refuse to budge from utilising their own couriers. These items were ordered for my son’s wedding and I am very angry and disappointed. They have no desire to satisfy their clients. I have phoned their call centre twice and have forwarded three emails to their customer service for which I just receive their standard reply. The employe that I dealt with are Gregory and Khule. Khule is extremely rude and insists on trying to talk over me. I am awaiting a call from their Manager Robin, who never seems to be available to take calls!!