What's the True Name of God?

[Mo MHuintir]

Jeremiah does refer to the written word. When you stated;

"However the context isn't about them writing the Word of God, but merely promoting their own vanities and prophets were giving false prophesies and claiming them to be of God."

that was an incorrect interpretation. Jeremiah does comment about the false prophets and their lying words;

Jer 2:8
The prophets prophesied by Baal,
NKJV

Jer 5:31
The prophets prophesy falsely,
NKJV

But in 8:8, Jeremiah makes it a point to say "et sheqer" the lying pen. In other places he refers to lying words, but here he specifically says a pen. By use of the waw consecutive, he ties the lying pen contextually to the torah, the written word of Yhwh.

When Yhwh gave Israel the Torah (the 10 words or utterances); Moses himself testified,

These words the Lord spake unto all your assembly in the mount out of the midst of the fire, of the cloud, and of the thick darkness, with a great voice: and he added no more. Deut 5:22 KJV

"and he added no more."

Who then added the other 603?
This is the heavy burden that Christ referred to in Matt 23:13. Namely, the oral Mishpah, that would become the Torah Mishnah. It is a corruption of the original Torah given to Moses,

"Love Yhwh with all your heart, and your neighbor as yourself."