Just give me back my money...

I should have know after last experience I had with this airline that bad service is a norm. I travelled with them in July and I had an infant with me and was allowed to take one bag over 20 kg because I had an infant when I departed in Cape Town . I came back a week later and was made to buy a new bag for baby things in jhb airport. I took my last money to buy a bag how pathetic. The worse thing is our medical aid used them as rewards partner so I’m forced to use their service. I am not happy and I will write to the medical aid as well . I then booked a ticket on their promo and noticed the destination was not correct tried fixing it and now I’m waiting for a refund and I need to book another return ticket but I need my money back please.