Disappointed and feeling stupid as if I do not know what is going on.

Struggled for weeks to sort out my credit card after FNB moved credit facility from budget to straight funds. According to the FNB app and internet banking I had funds available, but apparently I had no funds available . This lead to confusing on my side trying to keep track of what is available and when it is available. Thinking that there was funds available, and trying to transact only to be humiliated in public. I put in effort since July to sort it out via numerous phone calls and a visit to the bank (only to try to explain my problem over the phone again). Every time hopeful that it has been resolved. I would be uncertain if a transaction will go through or not even if the balance showed that there was supposedly funds available. Finally after ending up in the collections department, suddenly the balance was corrected. But all the transactions that were declined etc, is at my expense.