Treated unfairly with no Valid answers

I deposited money in my credit card, actually paid up my credit card. When I wanted to use the money in the credit card there were no funds. Tried to call FNB to check what is wrong none of the consultants could give me a straight answer instead was sent from another consultant to another with no proper feedback. They said they will call me back it has been 48hours now and no one has called me. This is such an inconvenience and there has been no help at all from the bank