Helpless and hopeless consultants

I've been a die hard FNB client for about 3 or 4 years now and they've been amazing.. Up until recently. There has been money disappearing from my account and I'm not referring to debit orders, I've been calling their call centre day in and day out for the past 3 weeks and no one is able to assist me. Nobody can give me answers, I've spoken to so many consultants that I have even stopped asking for their names. I'm 21 years old and I've only started working this year, I have a low income and now I still have to deal with money being taken from my account and no one can give me any answers. There have been logins on my online banking at random times throughout the day, when I called in about that, I was told that someone could have the same login details as me. How is that possible? When I asked if someone could be wiring money out of my account, the response I was given was "oh, maybe. That could be possible." Yet nothing was done about it. I'm very disappointed and frustrated with FNB.