Accidental Overdraft Reduction

On the 7th of April I unknowingly, and by accident reduced my overdraft and now my account shows a minus. The same day I went in to the branch and asked to be helped. They couldn't help and ended up sending an email to request my overdraft to be reinstated. After that I never received any feedback from the branch or anyone else. I spent countless hours on phone calls, FNB app chats and no one can help me sort out this problem. Today i started to get messages from FNB to say that they are going to start taking action against me if i dont sort this out. I dont get it! Honestly. This is all i have been trying to do for the past three weeks. I really am at my wits end. Who in FNB can help me?