Poor after sales service for online order gone wrong

I have ordered online and chose the incorrect store for collection by mistake. I have immediately phoned the call centre to rectify the error but was told that my parcel was already dispatched. The consultant was initially not prepared to assist me at all but then promised to see what she can do. She also promised to phone me back within the next hour which was two hours ago.I have not had any feedback at all. I refuse to double order as a precaution. If the consultant,Krishnie, really wanted to help she could have phoned the courier company and request the change of city within minutes. This was my first online order and although I was very impressed with the user friendly site and the fact that I have received confirmation of my order within minutes I am utterly disappointing in the fact that even though I phoned within minutes immediately after receiving the email I was told that I had to re-order and hope for the credit on the incorrect delivered parcel. I will not accept a notification of my order being sold out either as I have notified Mr Price home and they had enough time to correct the error.