I also have a publicly accessible email address and phone number for my work. Should it be OK for someone to keep calling me incessantly and lock my phone line

I also have a publicly accessible email address and phone number for my work. Should it be OK for someone to keep calling me incessantly and lock my phone line such that no one else can come through? Of course not, and that's why there are tools to protect against phone and email spam, and that's why it's good to be polite and not abuse a service. Especially a free service.