Refusing to refund deposit

We stayed in a chalet at Umfula resort in the Parys area for a weekend. I had to pay a breakage deposit prior to our stay. I was given a form to complete with my banking details, they promised to refund me an EFT after our stay, which never happened. They just ignored my e-mails, and when I phoned they took my banking details AGAIN and promised immediate payment, but still nothing happened.