I ordered a Stella McCartney dress, paid full pric...

I ordered a Stella McCartney dress, paid full price, and also paid for expedited shipping so I could wear the dress to an event this past weekend. The store sent the dress and failed to take off the security sensor. I was able to go to a local store and have the sensor removed, and I requested that Selfridges refund me the expedited shipping costs because I wasn't able to wear the dress. They said no! Seems to me if the store made the mistake and sent me the dress without taking off the sensor, they should do something for the inconvenience I had with both not being able to wear the dress to the event and having to go to a few stores to find someone that could take off the sensor. Incredibly poor customer service and will be my last purchase for sure!!!!