SAN parks non refund

Having managed to secure the bookings we wanted and paid in full, due to Covid we had to cancel. this we did well within the month required for a full refund from SAN parks. To date, we have been refunded about three quarters of the total amount we paid but are STILL WAITING for the remaining R1,000 + refund. I have e mailed SAN parks but just had the standard format reply. "We're busy!"I have phoned their Pretoria office and the switchboard put me through to customer care. Care is just a name. the phone rings for a while then goes dead. NO ONE BOTHERS TO ANSWER. I don't know where to go next.