Due to all these spammers, I am not sure which calls to take and which not and I am missing a lot of important calls.

i basically don't take calls anymore unless it's someone on my list- I figure if it is important they will leave a message

This is a scam they try to get phone inputs.

I was searching for a program to block spam etc.

It’s a scam try to act as they do a survey and get your phone data

They want to know if I have a landline