I am livid with the service received from FNB

I got a call today from fnb loans saying i owe them money. I was retrenched in mar and i have an approved claim for 6 months. So i do not owe fnb anything til oct 2017. I was refunded for my march payment which was an error and i did pay it back. The person i spoke to earlier said it is not reflecting on my statement despite me paying back the money months ago. I now see that the lady i spoke to has now deducted the r700 odd off my account. I did not give permission for this. I owe fnb nothing and it is disgusting and ******** that you just take money off my account. As the top bank in SA , i do not understand why I am getting such bad service from you this year. And as a premier banker, I should not have to put up with this sh*t over and over again. If you look at my previous complaints, you will see that i have had enough. Best this gets sorted out and the money paid back into my account by the end of the day or i am moving my account to anothet bank who has their ducks in a row. And i will be contacting my lawyer for ********ly taking money off my account.