Getting back my deposit!

I was renting one of the Hillbert construction apartments in Meyerton. I paid my deposit and rent in full and stayed there 11months. I notified the guy I was dealing with (Ryno) in advance that I would be moving out on the end of the next calendar month. That was End Oct 2017. I am still to this day awaiting my deposit refund. When I reach Ryno he tells me he no longer works for the company. He gave me contact details of a Jonathan. I have been trying to contact him since last year Nov. I also have been struggling to find where their offices are in order to go directly there.