Damage to exclusive dress

I took my dress to Elegant and they happily accepted it. When i went to collect the dress the colour had run on the dress and the owner denied it despite me having photos to prove it. <br> <br> The owner said that she would rewash and there would be no risk of colour running. To my horror, I collected the dress the second time the colour had run even more. <br> <br> Eventually I called the owner and she said it was my fault the colour had run and refused to discuss the matter. She was rude and slammed the phone on me. No apologies, no explanation.<br>