Don’t answer , it’s annoying marketing call

Spam call - hung up

Cold called for a couple of days. Eventually decided to speak to a rep and ask them to remove my number and not to call again. They confirmed it had been done.
Two days later had another call, this time from a blocked number. Told them the same; this time at that point they hung up.

Automated message saying 'dear valued customer, if you feel you are paying to much for your energy-'
At that point i hung up.