That they do this shows that they have been getting bad publicity by calling the wrong number and give private information to the wrong person. Now and then you

That they do this shows that they have been getting bad publicity by calling the wrong number and give private information to the wrong person. Now and then you see articles about this or that hospital sending faxes with patient data to some company fax by mistake. I'm sure this also happens with phone calls so they are just trying to cover their back, has nothing to do with your security. They get annoyed when it means more work for them.