FNB account balance ****

I am very disappointed with FNB. This is is the second time that they putting a negative balance on my account. Last time they did this, it inconvenienced me for a number of days while they fixed the issue, only for them to realize was their system that had glitches, I know don't how. This time again, I have a negative R231 balance on my account and a pending transaction, that should not he pending at all. To make matters worse, I spent all morning calling their call centers which did not help at all. One of the line remained opened for 2 minutes while I listened to the agents discuss their private business and not being assisted. Then the other agent left me holding for more than 20 minutes, while they said they where checking my account. In all this. I still haven't been assisted