DEBIT ORDER REVERSAL SECOND TIME THIS MONTH

Why does FNB insist on processing unauthorised debit orders, i complained just two weeks back no one has assisted me until this time. How does your loyalty lie with people that are not your clients, my account is overdrawn because they authorised a debit order without my knowledge with money that i dont even have for the second time. DO yourself a favour and stay away from FNB your customer service is lacking im going to the branch to have my account close people can just go into your account and take your money and FNB allows them