Despondent with FNB customer service

At least on three occasions I noticed that money less than R100 disappears from my FNB credit card. The first time I let it go then I started to to attention. The second time I had evidence and called and my money was returned with no explanation. This time R83 has again disappeared with no explanation. I used the "Secure Chat" option on the APP to get an explanation because i cannot see where the money went from my side. I didn't receive any help. I called the credit card division it was less helpful and I was told I will be put through Care. When the Care person answered she told me the system is slow and needed to reboot and will call me right back. Over 24 hours later I'm still waiting for that call back. The three engagements with FNB personnel can be described as indifferent. I experienced the same indifference with the homeloan chap. After calling and send texts and emails, there were no responses. At least I was wise enough not to switch my homeloan to them. The customer service is appalling. If you don't complain via social media you don't get assisted.