Bad customer service

I have ordered my dress from African fashion house I received an email saying it was ready for collections between the 6-8 of March. I sent my husband to collect the dresses but he was told the dresses have been sold. How do you sell something that has been paid for. Worst of I can't reach them on their contact number. I've sent messages but no one bothered to call me. I'm so disappointed with this shop and the reviews I've read about this shop now just makes it worse.