Sometimes they ask for the 800 number on the back of the credit card, so they can check my (fake) account balance, and I give them the number of the FBI (800-225-5324).
Once more a primitive trying to be too clever when telling a bouncy.
This never ever happens,one preauths a card with the account number and expiration date alone.
The 3 digit (4 digit for AMEX) number plus address and zip can save fees for the vendor but are still not required in many cases.
They are just really stupid.