Same here, The address listed above is residential per Google, also there are 435 Rafael Sanchez in US at least per my search so good luck with this, IMHO, this must be a business phone which is calling to verify phone numbers it must be an automated service.
Have received at least 6 calls from this number. It is an autodialer for telemarketing a contractor. The reason for the dead air is if there is no agent available when you answer it will not connect. ATT will not investigate, referred me to FCC. But you need a real number and company name to report to FCC.