Isaiah 58:6 Is not this the fast that I have chosen? To loose the bands of wickedness, To undo the heavy burdens, And to let the oppressed go free, And that ye break every yoke?
Read this chapter to learn about the fasting that God wants. It is not about getting God to line up with what we want but for us to line up with what He wants.
He told them when they fasted that they were to make changes in their behavior. It would mean that they would treat people better.
I challenge you to take the time to read this chapter and better understand this topic!