New order could be ready but replaced order has no stock?

Absolutely outraged at jets disgusting lack of customer service!!!! ??? I placed an online order just over 2 weeks ago. It was supposed to be couriered to be (think it was within 5 days). The courier got hijacked - unfortunate and understandable. However the way it has been handled is RIDICULOUS. It was suggested I cancel my order; well the order was for work, I can't do that. Then I was told it would take them 1-2 weeks to resource the items. Puts me in an awkward situation as that's too late for when I needed it, but I do understand... However I then discovered that if I placed a brand new order with their website I could have the EXACT same order delivered within 5 days.....now wait a minute. Why does it take 1-2 weeks to REPLACE an order already placed, but only 5 days for a brand new order???? When I brought this to their attention I didn't really get a proper response, but was told she would try get the items dispatched to me.... 3 days later and I keep getting told there's been no confirmation. Why on earth does it take so long to get confirmation? I am absolutely stressing about this, as I need these items by tomorrow - which I have been very clear about since the first time this issue was brought to my attention.... Yet they're still leaving me in the dark. And this morning I was told by the sales person, oh but I told you to cancel your order. Seriously that's the resolution?? Because that really doesn't help me. I absolutely cannot understand how when the online store would allow a new order to be placed and delivered within 5 days, mine cannot be resolved in that time frame or less! Absolutely pathetic.