Poor customer service

I got a call from Fnb today telling me that someone has deposited money into my account by mistake, it wasn't meant for me. The lady that I spoke to didn't ask for consent if it's fine that she can reverse the money, She just canceled my card without telling me and reversed the funds that were in my account without my consent. As a client of Fnb I'm really disappointed and very angry the way the lady that I spoke to handled the whole situation.