How did the Rabshakeh respond to the request for him to speak to Eliakim, Shebna and Joah in Aramaic?

He responded by standing and shouting in a loud voice in the Jew's language.

Briefly what did the Rabshakeh say were the words of the king of Assyria with regards to Hezekiah?

He said not to let Hezekiah deceive them because Hezekiah wouldn't be able to rescue them and he said not to trust in Yahweh.