SAA stole my money!

On the 21 September 2017 I called the reservations contact Centre of SAA to add an infant ticket to an existing booking. The existing ticket was booked through travel start at a price of R1967,25 SAA was meant to charge me for the addition of the infant. Instead, they charged me for an additional ticket (for me) plus the infant ticket at an amount of R2560. I immediately called them back to alert them of the mistake. They then apologized and promised to refund me within 7 working days. On the 30 September 2017 I travelled to Cape Town with my daughter (the infant). She was checked in on the ticket booked with SAA and I checked in on the Travelstart ticket. Prior to traveling I called SAA to find out why they hadn't reimbursed me yet and they told me to not use the SAA ticket as it would now take longer than 7 working days to reimburse me. So I didn't. I have called them several times to find out why I haven't been reimbursed yet. Each time they have a new story. The latest story is that I can only be reimbursed on the travelstart ticket because the SAA ticket was used. But it was used by my daughter(the infant) that it was intended for and not for me!