Took my deposit, didn't do the work, and won't return the money

This story starts happy, but has a bad ending... we employed Adam Wedel from Secure All Security (http://secureall.co.za/) for a minor repair to our electric fence, and were happy with the service we received. We then asked him to perform a larger job, repairing our RoboGuard system. I received and approved the quotation and paid the deposit (R13'995) on 17 July 2017... and then we waited. After 10 days I started emailing Adam; he got back to me quickly saying that he'd had some staff problems, but he'd make some arrangements. After many, many more emails, more excuses and weeks of waiting, it is now mid-December (5 months later), he's still making excuses, and he still hasn't returned a single cent of my deposit.