Free caller ID

Called twice firstly to tell me that my electricity bill will be lowered - is that okay? Do not answer this question as it can be recorded and used as contractual obligation. It was all very casual conversation then demanding info about my electricity suppler - ie who is it? Sorry, But logic tells me not to answer this as if it was legitimate, My supplier would not ask me who they were! Also called me “my dear” which raises my hackles, As I have a more personal connection with people I do bu