Unprofessional and not refunding deposit

Rikus came to see us. We didnt' accept quote at first, then he reduced the quote at which we agreed on price. Insisted on 70% deposit, which we paid. It is now three weeks later we haven't seen them and we phone on a daily basis for our refund. Not responding to our calls and when they do, it's because we call from different nos. They keep on promising to refund. Still waiting. Now we heard the R7000 is in a fixed deposit. Seriously???