FNB TAKING MONEY OFF MY ACCOUNT

Recently FNB has been taking money from my account and categorize it as #Items Paid No Funds. While all transactions and & debit orders went off from account. On 05 Sept they took R141.00 from my account On 10 Sept they took R435.00 from my account On 17 Sept they took R47.00 from my account On 18 Sept they took R235.00 from my account. I've banked with FNB since 2011 and I've never seen this nonsense!! I want my money back or I'm leaving you as a Bank