I don't know if u can do this on your phone but when I get calls from people I don't want I just block there number. U should b able to go into settings, go to Phone, then go down to blocked. Put there number in and they can't call u anymore. Oh first make a new contact for them. When u put a new contact in your phone and they ask for, First name I make them up like dumb [***] or Joe Blow. Then put there phone number in. Then go into your settings and do what I first told u it's really easy. I have about 18 in my phone now. Good luck
Now that you've practiced your no-call request here, deliver it to the actual caller, which does not maintain this site or this web page. How you handle this depends on the type of caller and what's been said, which for the readers would have been very useful information to share. That is the function of a mystery caller site.