Fnb ***** on clients accounts!

Hi my FNB account is being debited by R200 on a weekly basis and the transaction description says "item paid no funds" Is this how FNB is trying to de***** their clients? My account is debited while there's a running balance that's enough for my debit orders. FNB CLIENTS BE ON THE LOOKOUT OR START LOOKING FOR REPUTABLE BANKS TO BANK WITH! I'M so annoyed and feel so helpless! Definitely moving to another bank! Mlambo Keketso