disputed debit order still went thorugh

i have a deit order from altech netstar of R119 , i tried to call them to cancel my tracer and they were nowhere to be found so i decided to reverse debit order and stop it completely, i did that more than 4 weeks ago only to see that this morning netsatr debited my account of R238 which is very difficult for me to dispute online, i called fnb, they open at 8 , what kind of service is FNB offering to their clients, really what is the purpose of stopping debit orders if they will still go through, its no safe to bank with FNB trust me, Bidvest is a way to go.