How would you feel?

I really don’t understand what’s the problem. I blocked my child’s father because he’s not doing what he needs to do as a father and plus he’s toxic af. So of course when I block him he contacts my mother…. Because he knows it’ll get back to me. I asked her not to reply to his messages and she still does it anyway. I don’t get it. Like ok he text you, you read it… why do you need to reply if I’m literally asking you not to. Would you be upset for something like this or would you pay it no mind? I’m literally trying to cut him out of my life and by her replying it’s still giving him the feeling like he has access to me somehow. It’s annoying AF! 🙄