Moses and Aaron went to Pharaoh and told him, “This is what the Lord, the God of the Hebrews, says: ‘How long are you going to refuse to humble yourself before me? Let my people go, so that they can worship me.
I will give the Egyptians a stubborn, hard-hearted attitude so that they will chase in after them. Then I will gain respect through what happens to Pharaoh and all his army, chariots, and horsemen.
The Lord told Moses, “When you get back to Egypt, make sure to go to Pharaoh and carry out the miracles I've given you to do. I will make him stubborn and he will not let the people go.
But when Pharaoh realized the plague had passed, he chose to become hard and stubborn again, and wouldn't listen to Moses and Aaron, just as the Lord had predicted.
Due to your hard-hearted attitude and your refusal to repent, you're making things far worse for yourself on the day of retribution when God's judgment is demonstrated to be absolutely right.