Very disappointed in the lack of service given by Airlink

I am getting married next week and booked my flights in advance to save money as my mum and dad are pensioners not earning an income so I literally have to pay for everything myself I mistakenly booked my parents flights reverse route, I called Airlink and explained this to them today note departure date is only next week Tuesday I was informed they cant help me alternatively I must pay R4100 additional per person when requesting a route change I was also told I can't change the flight eventhough my mum and brother only fly out next week so there's a whole week in between the flights. I asked for a refund and was told I will only get R450 back where I paid close to R5000 for these flights. Granted I made a mistake however there should be some type of human element and airline's like this one should not just take advantage of us I have traveled with safair before where I had missed my flight and they helped me without an extra charge I have also changed dates and routes with no hassle. We are all experiencing financial trauma currently but service is something that's very important rather use another airline who will go the extra mile for you in your time of need than just say sorry pay 8000 or we can't help you.