Get a free, 1 week subscription to FORMED.org and watch the Symbolon series for starters. Pay attention to the parts about salvation history.
By the time of Christ, there were many sects of Judaism. The Pharisees were one sect, and obviously started to become an important sect because they were the only sect to survive after the destruction of the Temple (rabbinical Judaism is based on the Pharisees, but with the Sadducee’s non belief in the afterlife).
There were other sects of Judaism, like the Essenes, that had a more spiritual understanding and a less literal understanding than the Pharisees.
The problem was Judaism, at the time of Christ, had so many different sects by then that no one was sure which sect was closes to God’s teachings (kind of similar to all the sects Christianity has now). And most importantly, most of the leaders, were not following God’s true intent.
So again, it’s not so much that the OT was wrong, but more that the Jews either took it too literal or over time forgot to the true meaning of the scriptures. It was not uncommon for the Jews to do what today’s Protestants do… take a line of scripture too literal and not understand it within the context of all scripture.