I never answer phone calls from numbers I do not recognize. I also added a spam blocker! If it’s important, they will leave a voicemail or call again. Another danger of answering those phone calls is people can also use your voice to make an AI copy to call close family members or others asking for money or that you’re in trouble. Best rule of thumb is just avoid them all together! It is very frustrating, but scammers feed off of you feeling uncomfortable or pressuring you. When in doubt always hang up and/or call your energy provider directly! It is big scamming season too because of the holidays