Quick to take but what a struggle to give!

I placed an online order last week and my order was quickly dispatched to me (thank you for that quick service), but when I opened the parcel, the contents were not what I ordered. The waybill I signed was my details and my order number but the contents were not mine. I then made contact with the Customer Care centre (phoning didn't help as I didn't get through to an agent, so I rathered email them). They contacted me the following day and was put through to Dis-Chem Meadowdale from which my order came from. I spoke to a Danté who confirmed that the other order (I got the order number from the slip inside the parcel) has not been sent yet, which probably means my order is still in the shop. He said he will send the couriers or his driver to come and collect the incorrect order. I asked him if he will please send my order so that it can be a swop. He said he will look for it and see what he can do. Yesterday RAM Couriers arrived and they wanted to collect a parcel for Dis-Chem. I asked if they had a delivery for me and said it was only a collection. I refused to send the incorrect parcel until I receive my order, which by the way has been paid for. This morning I received a call from RAM Couriers to confirm if they can come and collect the parcel. Again I said to them that I will not give the parcel until I receive my order. Dis-Chem please send my order ASAP!