Contradiction with Job 30:20
While Psalms 56:9 suggests that God hears and acts when called upon, Job 30:20 expresses a feeling of God not responding to cries for help.
Job 30:20: I cry unto thee, and thou dost not hear me: I stand up, and thou regardest me [not].
Contradiction with Jeremiah 14:12
Psalms 56:9 implies God answers prayers and supports the faithful, whereas Jeremiah 14:12 shows God refusing to listen or help despite prayer and sacrifice.
Jeremiah 14:12: When they fast, I will not hear their cry; and when they offer burnt offering and an oblation, I will not accept them: but I will consume them by the sword, and by the famine, and by the pestilence.
Contradiction with Lamentations 3:8
Psalms 56:9 shows confidence in God hearing prayers, but Lamentations 3:8 describes prayers being shut out or blocked.
Lamentations 3:8: Also when I cry and shout, he shutteth out my prayer.