1)
Why does it say "v'Lo Sham'u v'Lo Hitu Es Aznam"?
1.
Malbim: They did not hear, and they did not even bend their ears to hear.
2)
Why does it say "Lashuv me'Ra'asam l'Vilti Kater..."?
1.
Malbim: They did not repent for the past, and did not cease offering from now and onwards.