Shocking treatment by Sun International

I made a booking at The Palace at Sun City last year. Due to medical reasons I had to cancel the trip. The cancellation was done more than the required 30 days before booking date. The full deposit was due to me and I am still waiting. Countless e-mails, phone calls and now in January refund request forms, proof of payment submitted etc. The telephone number mostly rings, if someone picks up the responsible person is never there and so forth. E-mails goes unanswered. It has been more than 2 and a half months and still no refund. It is a small amount but it's about the principle. Initially I was told that the payment was done and could take up to 10 business days to reflect. Then there was a system error. Still no funds. We regularly visit Sun International resorts, but after this treatment would rather consider alternatives.