No Message Left, but caller keeps calling and hanging up

Automated calling system that responded to my hello with "please wait for the next available agent". Finally a woman came on the line and wanted to ask me questions about my home ownership and financial status claiming to be offering an energy savings program. I did not answer her questions but she was nice enough to tell me what they were looking for (home ownership, no late payments, GOOD CREDIT, blah blah). NEVER answer questions from people who cold call you.

ESA on caller id with no message

Caller from ESA about a "federal energy savings assistance program". Provided no information when I asked for details, i.e.  name of program(s)...

Agent did a cold transfer to supervisor during the call, as if I had agreed to participate. Supervisor was not too happy about this.

Calls my home phone # but leaves no message - Am on No-Call List - Have had no contact with
this Company