Your argument is with God, not me. God said he hardened Pharoahs heart.
And lest the same old argument be made, Scripture does NOT first present Pharaoh has hardening his heart and then God hardening it. The first mention of the hardening of Pharaoh's heart is in Gen 4:21
And the LORD said to Moses, "When you go back to Egypt, see that you do before Pharaoh all the miracles that I have put in your power. But I will harden his heart, so that he will not let the people go.
Notice, as emphasized, that it does not say He hardened Pharaoh's heart because he would not let the people go, but rather so that he would not do so. The results of Pharaoh's refusal of course was severe judgment.
He will have mercy upon whom He will have mercy, and harden whom He will harden.
You addressed nothing in my post.