FNB Misconduct.

My church opened an account in Mdantsane . Cheque Acc which had 3 signitaries .3rd Sept they all had an sms of the withdrawal of R2500 and decided to block the acc in the evening but this morning again R2000 was withdrawn from the account. They went to a bank to inquire about the withdrawal to their surprise they found out that they are no more account holders of the account. When they enquire to the manager and he didn't want to co operate with them. He told them some other people were at a bank and they said they were also from church to change the signatories. My question how can a bank change signatories without a proper hand over. Meaning anyone can go and make changes in East London branch because you won't find that in other FNB . Doesn't FNB have the same procedures ? FNB is responsible for these ********** people. East London FNB branch has disappointment me and our church members and now we lost R4500 because of *********** bank officials in East London. We were left with no choice but to open the case ,and the responsible person was irresponsible and arrogant.