Funds not allocated,therefore no delivery of goods

On the 13th of July I bought two watched form Groupon, buy one get one free....<br> I got notification that my order has been placed and needed to make the payment in order for delivery of my goods, I then made payment immediately and noted or provided the same reference number that they have given to me....when I called to follow up if my goods will be delivered I was told that by the time payment reflected on their side the offer had already expired, I then had to supply proof of payment for their finance department to allocate - which I don't understand as payment reflects immediately if I made payment from an FNB account into their FNB account, a delay only takes place if different banks are used, anyway I sent through the POP, and today when I checked with them I was told I used the INCORRECT reference number.....mind you this reference number was given to me by them, how can I then used the incorrect Ref?<br> All I want now is my money back...this is unacceptable!!!