They’re calling to confirm if you’re the home owner to sell you solar panels. When you ask them to take you off the mailing list or call list, they hang up on you.

Tried calling back (because I was curious) and it goes to a call centre that has a recorded message (in American accent) that says “your call is very important to us, please stay on the line and you’ll be transferred to the next available agent”. I hung up after waiting five minutes.