Contradiction with Amos 3:7
Numbers 6:22 suggests direct communication from God to Moses, while Amos 3:7 indicates that God reveals his secrets through prophets, not directly.
Amos 3:7: Surely the Lord GOD will do nothing, but he revealeth his secret unto his servants the prophets.
Contradiction with Hebrews 1:1-2
Numbers 6:22 implies God spoke directly to Moses, whereas Hebrews 1:1-2 suggests that God now speaks to us through His Son, not directly to individuals as in the past.
Hebrews 1:1-2: God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets,
Contradiction with 1 Samuel 3:1
Numbers 6:22 presents God speaking frequently to Moses, while 1 Samuel 3:1 describes a time when the word of the Lord was rare and there were not many visions.
1 Samuel 3:1: And the child Samuel ministered unto the LORD before Eli. And the word of the LORD was precious in those days; [there was] no open vision.