We see those that were messengers of Balak, used deception as well as Balaam. They did not say that the LORD'S hand was in it, and therefore he did not come. But that he refused to come. Probably, by what followed, they led their prince to believe he would yet come, if the offers of reward were made larger.
Related Commentaries of Numbers 22:14
Numbers 22:14
14 And the princes of Moab rose up, and they went unto Balak, and said, Balaam refuseth to come with us.