My bank called me the other day and the person who spoke to me failed to give me a single evidence that he is calling from my bank.

* The bank number is hidden just like many other companies maybe because they use VOIP to make calls or they don't want you to ring them back on the number they call you from.
* The person I spoke to refused my proposal to *mutual verification* of our identities when I asked him to tell me my account number since all the information he revealed to know about me was my name and phone number which are available to the public.