Dont buy from Truworths Online, stock not updated

I bought 3 dresses online for my brides****s for my wedding in march, already paid, got the confirmation and everything. a WEEK later I receive an email stating that my order has been cancelled as there is no longer any stock and my money refunded in 7-10 days. this service is completely unacceptable. i bought the dresses when there was stock,i even phoned the stores. now what am i supposed to do??!