"People still answer their door or phone for unknown callers in 2018?"
Why would you? Expecting a lottery winning notification or something? Guess what... they'll leave a voice mail if you won millions.
Other than being so lonely and hard up for human interaction I haven't the foggiest idea why anyone would answer their door to a stranger. Nothing good will come of that transaction and you're opening yourself up to a potential world of problems.
If nobody answered their door to solicitors or phone to unknown numbers the solicitor would become extinct the next day. Do your part.
Riding in the same boat.
Lessons cost money. Good ones cost lots. -Tony Beets