Non Refundable Ticket

I booked and paid a ticket on the 04/03/2015 from JHB to Cape Town and retrun. <br> My friend is now moving away from Capetown, i do not know anyone in cape town so i will never use the voucher they are wanting to give to me. They also do not want to refund my ticket. what am i suppose to do with n ticket i'll never use???