Ex friend

I'm so annoyed with my ex-friend rn. I blocked him and chose to stop talking to him. He knows I don't want talk to him and yet he finds a way to text me anyways. Today, he used his trans bf to talk to me. This frustrated me bc my bf knows I don't want to talk to this ex-friend. He even called my bf by his dead name. How should I handle this? This is the second time he used someone else to talk to me.