gods-mouthpiece

Mouthpiece of God!
Question: 1. Can God (YHWH) change Lie?
2. Did YHWH is same in old and new testament?
3. Can a real God(YHWH) of Bible guide his real servants or people guide wrong and say that true teaching is coming in                            future!
These questions are rel and Governing Body need to answer them. If any one can answer please write in the comments.