The real question is, what does the Bible say? I don’t have time to discuss the context, but if I could paraphrase John 3:13, Jesus essentially says, ‘No man has ever ascended to heaven and returned to speak of heavenly things, but the one who is in heaven came down to speak of heavenly things.’
Jesus is saying He is the only one to come from heaven with a message. No one who died and came back to life in the Bible ever spoke of what they saw, and Paul speaks of knowing a man caught up into heaven and declares that what he heard would not be lawful to repeat.
The truth is, all these claims are nonsense. They contradict each other and often conflict with the scriptures. Avoid them, and anyone who claims such experiences. You have God’s Word, and it is sufficient.