Unhappy customer

I am deeply disappointed in the service received from Travelstart. I booked a flight ticket from Durban to Port Elizabeth for the 26th of September and due to work commitments I needed to change the date to the 2nd of October. I paid R1500 for the ticket for Travelstart to request me to pay R1908 to change the date is ridiculous to say the least. How can changing the date cost even way more than the actual flight. I promise to never ever utilise your services again this is a total *******.