Radunzel, I would like to know what your religion is...sometimes you are quoting from the Quran, advertising Shia and Quranist websites, and other times condemning the Quran and saying that the God of the Quran is not the same as God of the bible, etc. In any event, it seems you are really confused.
Anyways, the ayah you quoted 13:40 "Your only mission (o muhammed) is to deliever quran, while it is we who will call them in account"
In reality, the word "Quran" is nowhere mentioned in this verse. Instead the word balagh is used which means the duty of the Prophet (alaihi salatu wa salam) is to convey the message of Islam.
And it is the exact same case with the other verse you quoted: 5:99-100
"The messenger has NO function execpt delievering quran
The word Quran is not mentioned at all, only the word balagh (to convey a general message).
As for the hadith you quoted, it is being addressed to the companions of the Prophet (alaihi salatu wa salam). They were given specific instruction not to write down the Prophet's sayings, but rather only to memorize them. The reason for this was there was a danger the Quran and hadith could become mixed up, they needed to be kept separate until the Quran was compiled.