FNB Bad online security

I am very disappointed in first national bank and its online security system, i was de*****ed close to R13000 from my account, i went to fnb for assistance but they could not assist me with anything, they didnt even give me a reassurance that they will look into my case. all they did was give me a form to fill out and fax to their ***** department. i havent had any feedback from their ***** department please fnb i have been a loyal customer please assist as i want my money back.