Flight change effected after payment - and ticketing officer refused to make the change in ample time

Good day

Please assist.

I am being sent back and forth by South African Airways and Travelstart. I paid, a month in advance, for a date change on the flight Booking reference VFH7A6 SAA Case *** Travelstart refund for booking ZA***9

I changed the return date from Harare to Johannesburg, from 27 to 16 December 2024.

At check-in on 16 December, I was referred to the SAA ticketing office, because my new booking was not reflecting. The SAA ticketing agent would not change the flight to match the payment, even though I was early and the flight, actually left late, due to a delay (as per the check-in desk). I was forced to buy an alternative (Fastjet) airline ticket. Buying Fastjet ticket was unnecessary.

Both SAA and Travelstart will not take ownership of the change not being effected, and to process a refund. Advise how I can attach receipts and the communication between the service providers

Please assist me to get my refund

Regards