Extremely poor customer service following defective item return

I ordered a dress online well in advance for a wedding. On the day of the wedding, the dress tore at the zip when I got into the car on our way to the wedding. The dress fit me perfectly, but the quality seemed to be very bad. I contacted Zando about this, and their feedback was that there was extreme pressure app**** from the inside. They said that I was too big for the dress. I sent back the dress to Zando and followed up on numerous occassions. Months later, this issue has still not been resolved, and I did not receive either the dress back or a refund.