Lets say that a guy left you, but has been persistently messaging you on any medium (sms, whatsapp, facebook, email, calls, etc...) every few months trying to reconnect, after you initiated a no contact rule.

Also, you've decided that you don't want to reconnect or at least not in the way or as close to the way you were before. <-- This is the end goal I am looking for in any advice given regarding this topic.

Other than no contact, what is the best way of making that happen? or communicating that?

I was thinking that the solution might have to be something not direct and straightforward in communicating to him (just in case this actually further provokes him if he happens to be a sociopath or manipulative person) and because you want to maintain some sort of civility. Indirect approaches are more smooth and complex than direct approaches - and directly stating your intentions is easy, but would it give the best outcome? So I am looking for more advice/solutions.

Maybe the right solution is just to keep no contact, and stop letting it affect you. Sounds so simple, but it's also generalised advice and doesn't handle every case. What if you respond to contact, how would you keep it so that it stays within accepted levels of redpillwomen certified appropriateness?