Slab
Occasional Tour Caddy
Companies who call and say they need to take me to through security checks to confirm who I am, but then don't know what to say when I ask them to prove who they are.
Then you need to be ready to ask them some security check questions of your own that'll satisfy you, like what date did you do business with them, what was purchased, what payment method you use etcetc
You can't just say 'prove who you are' and leave the validation route up to them, they will have no idea what info you need