Airlink don't give refunds

I have booked a ticket with Airlink in advance from Cpt to Bfn. In the mean time, I am planning to move back to Bfn end of March so will no longer use the ticket and return ticket. I phoned Airlink to enquire about a refund. I have paid R2600+. Now I can only get a refund of R300? It is daylight *******! If I sell my ticket, for every change on the ticket I have to pay R700, ending up not getting anything back either. The request for refund is well in advance of the end of the month, but no - they choose to do business like this