Get a Samsung 8+ it comes with a blocking feature, works well.
If I do happen to answer an unknown call that is trying to sell something, real simple.....
I tell them we don’t pay our bills.
That is the fastest way to get off the call list and it gets passed around.
I also created a fake person to use when I shop or buy from vendors that sell names to spammers. To get a credit agency to start a file on the fake person, donate money in that fake person’s name to a political party or pac. Only real people would do that right? No names get sold faster than that.
My HTC Phone has the feature where you can block any and all phone calls from a single contact. I just made a contact called Telemarketer asswipe and whenever I get a call from a telemarketer I save it to that Contact which is blocked from sending me any calls. Usually I will get 3 or 4 calls from the same group because they will use different numbers, Once I have saved them all to the contact they won't get through.