Unacceptable customer service with no real help from the manager

I ordered white cushions online on 13 Sep for a wedding 24 September. Only after after enquiring about my order this robbing 19 September after the delivery date was due, I get a phone call from the manager apologising for the 'inconvenience' but they do not have the stock they already sold to me and I have to pay an additional R1000 for something else. This is not inconvenient, this is bad customer service and completely unacceptable!