1)
"Ha'Lo" implies an incredulous question. What was difficult?
1.
Malbim: You imply that you called to me due to my importance, and because you love me. You hated me, and expelled me. I was disgraced in your eyes. Had you come to me at a time of serenity, this would show regret, and I would pardon you. However, you come when it is difficult for you, due to necessity. Why should I go to help you for free, as if there is a Bris of love between us?!