M.C.
My daughter is 3.5 and still wears a pull up at night. She has woken up a couple of times in the middle of the night and called for me, but she is so out of it she can't really talk. When this happens I take her to the potty, and in the morning she is still dry.
In the morning when she was alert, I told her if she woke up in the middle of the night, she was allowed to go potty on her own if she needed to. Her eyes got huge! She didn't know she could do this on her own - wow! It was a very big deal for her, because that meant she was really a big girl.
Sometimes she will go potty at night, and sometimes she will sleep thru it and have a soggy pull up in the morning. But she is learning. I know some kids "get it" right away, but others have to ease into things.
I would bring the night time pull ups out again, and tell him he is a big boy who can go to the potty on his own or he can ask you to go with him. Make the choice his.
If he has an accident during the day, just tell him to go change, and he has to help clean up (he made the mess, he has to help clean it) but other than that, don't show any reaction at all. Once it does not bother you, I bet he'll come around.
Good luck!