Bad service

Good day

I purchased a gift for a wedding at boardmans on the gift registry, order was successful. I was given all the information and ref number# ********** 99 so that i could track the parcel. This gift was bought on the 22 August '17, the next day when i tracked the parcel it read "Order handed to couriers". I then send an email to find out when will i be getting the parcel, they rep**** to my email by saying the the things i have bought is out of stock and i will be refunded back my money. I called this number "***" just to hear what is the story as the email says that the order was cancelled and when tracking the parcel it says it has been handed to the couriers. The lady i spoke to advised me that on her side it shows that the order was cancelled and i will getting the refund in the next 14 working days. What i want to know is why could i even proceed with the purchase with no stock at that time. The lady told me that the system must have not updated that the things are not there. i am not happy with the service as i have made a purchase before time because the wedding i am attending is this weekend and i rock up there with no gift. Why make us buy things online while they cannot even manage the online accounts.....