After an unfortunate event I managed to teach family members to never do any kind of bank actions in a call where they were the ones being called. Always end that call and then call the bank support back using the number they all know how to find on their credit/debit cards.
Most irritating thing the Amex did recently to me is to call me from a random number and then proceeded to ask me for my personal details like date of birth etc for "verification purposes". I promptly refused to provide any details as I have no way to authenticate them and cut the call. They are basically educating their customers to become vulnerable to fraudsters and I told them as much. But the call center person is the wrong person to hear that from me.
