failure to assist with unauthorized transactions on my account

For months i have had a debit order go off my account that i have not authorized- every month i go through the reversal process , and I am charged reversal fees - not to mention the fact that my credit profile is adversely affected with continuously reversing debit orders. i have requested that my bank FNB - prohibit this company ( whom I have no dealings with ) to refuse them to deduct from my account. IT CONTINUES - i dealt with ROE***A DAVIDS this morning i called in as another transaction has gone off my account - from some dating site that seemed to have access to my card details - and it is not met with ANY CONCERN or urgency to reverse it.

i am at my wits end. can FNB not protect their clients and follow our instructions. can random people just debit our account? without a signed debit order authorization form?

i want to close my account and stop my card - as i have no idea who all has access to my banking details the joke is i cant even get ANYONE AT FNB TO ASSIST WITH THAT i may not be a billionaire,,,i may be an average consumer but FNB has gone to the dogs!!!! NO LONGER INTERESTED IN HELPING CONSUMERS.