Thsi person uses a calling device that wants you to push buttons identifying yourself.They do not even have the common curtsey to call themselves.
I have never heard of this company before.

Calls over and over and over never really stating who they are or what they want only seeking information!

I've found out it's a "hacked" number scamming to obtain personal data for Identity Theft purposes. Never push those buttons - just hang up and report the number to your carrier / local phone company to block if possible.