Revolving Loan Unavailable after more than 15% payment

I made a payment of more than 15% to my revolving credit facility. Waited 3 days and still not showing my available balance. Contacted FNB, after been transferred a 100 times to the incorrect department got to someone who tried to help me. As per FNB i had a debit order return in November (Checked on online banking and cannot see anything), but where able to use my revolving loan in December without any issues. Now i have paid money into the account which i need urgently and cannot withdraw.

Everyday FNB is getting worse and worse and worse.

Think its time to start and look at different bank with better customer service.