stopped debit order still going through

fnb is failing em , i have been cancelling a debit order and stop oit , but it still going through, iam unable to get hold of the company and am no longer using their service but FNB allows them to debit my account, whose bank account is this its mine i tell the bank who should debut my account and who shouldn't, my money is no longer safe gere , am moving to bidvest guys , no one can touch your bid vest account with out your permission. all the numbers that i was given by netstar dont go through so i cut off the agreement