From what I understand you want a phone call or email from God proving Himself. That would be subjective proof.
Perhaps narses can arrange such communications. He is a master at ping lists, maybe he can help.
A phone call or email would do it for me. There are other things that would do it for me too.
Good, contemporary evidence, with a very good possibility of being false absent the intervention of G-d. The idea is to prove the intervention of G-d, hence proving existance, and capability.