Number was a missed call with no message

Said Odessa, Florida. Didn't answer. Left no message.

Called and I hesitated, but answered and the [***] hung up on me.

keeps calling me unwanted call.  when I call back message says unable to complete call
calls from many different numbers all beginning w/the 510 extension

Telephone at 10:12 AM 6-24-2016 - Advised they were Career Advancement - said I applied for position; continued with asking Personal questions ie education; date graduated from school; earnings per hour; each question I asked was responded with a robotic mechanical voice.