Call the leader and don't reply to the text messages.

I think it may really be because he is not available at night. If you feel sinister, calling him at night will affect his rest time at night, so he deliberately doesn't answer your phone. I believe this is a reasonable thing. I don't think he should change from hiring you to not hiring you just because you called him at night. I don't think this company is worth doing if such a small thing really doesn't use your ability. Because they don't consider whether you have the ability to sit in that position, of course, if you are still hired, it will only leave the boss with the impression that you are not very good at treating people, which will have a certain impact on your future promotion. All these have to reflect on whether you have done it right or not.