It is possible to buy a device that allows you change the inforamtion
on the
caller id box.   That information maybe a 111-111-1111 number or it
could be
the phone number/name of your bank/credit card company/etc.

So don't rely on caller id before giving out any private information.
If you're unsure terminate the call and call the person back to verify
who
you are talking to.

Be really careful what private information you give out and to whom you
give it out to.

This type of device should be illegal.

So to answer your question, it could have been the same person,
a telemarketer, a fraud, or a phisher.