I disagree with both answers in a way, because they are not complete. God said he wouldn't hear their cries for mercy and/or help in the old testament verses of Jeremiah. Now aren't you glad you are not under the old covenant, and rather under the new covenant, where God hears the cries for mercy from people who are dead in their sins?
The ones who bowed to Baal were dead in their trespasses, unrepentant and uninterested in God, just like we are when Jesus finds us. But God's covenant with them was that disobedience demands punishment enough to destroy the people. God made a covenant with the people of Israel and they broke that covenant, so God held them accountable for that. When Jesus died and shed his blood, he made a better covenant in that God makes a new covenant with the people of the world, all of who would receive Him. Now, if we stumble into sin, we stumble but we don't fall away because the seed of the Word through Jesus' blood remains in us.
Now, in the day of grace, the order is not to repent while you're dead in sin and then receive life from the dead works of sin. It's receive life from Jesus from the dead works of sin, then put your sin away and repent. You can't produce works of repentance when you're dead!
It's simply that the covenant of Jesus Christ was a better covenant than the tablets of the law.
The LORD said he was bringing evil upon the house of Judah and the house of Israel and the inhabitants of Jerusalem because they would not listen to his voice and do what he commanded them to do. So what's the significance of Jer. 11:14? They did what the covenant said they should not do. ie. they went after other gods to serve them, they set up alters to burn incense to Ba'al. So the LORD pronounced evil against them for their evil deeds. Jeremiah doesn't say anything about repenting or turning back or being forgiven. They're toast. This is an evil they cannot escape. Jer. 11:11