The Scripture says that the testimony of Jesus is the spirit of prophecy. This means that prophecy should show us the heart of Jesus toward us. The effect of genuine New Testament prophecy is that it should draw us to Jesus and give us a new appreciation of what a wonderful Saviour Jesus is.
Accuracy is not a reliable indication of the genuineness of prophecy. Psychics can be amazingly accurate.
If you have niggling doubts about a prophet or a prophecy, stop and evaluate whether that doubt is a check in your spirit from the Holy Spirit or not. It may very well be,and when you wait on God, you may find out that the prophecy may not be from the Holy Spirit.
A prophecy can come from the Holy Spirit, or from the world, flesh or the devil. Here are my views about how to recognise which is which.
The world: This is to do with making material possessions, social status, prosperity, and similar the most important. For example, a prophecy promising you that you will have a bigger house, better car, higher income, a more important role in life or in the church, may very well originate from the world.
The flesh: This is to do with self improvement, self promotion, personal needs and desires. For example, prophecies to do with being a better person, being more holy, getting personal needs met, fulfilment of personal desires, issues to do with having babies or meeting a partner. Prophecies that cause you to put the prophet up on a pedestal, making you think that he is such a wonderful man of God. Prophecies like this can come from the flesh.
The devil: Anything that reveals sin, brings condemnation, contradicts the promises of God, generates fear and doubt, brings hurt and disappointment, especially with the church and God. These prophecies are more likely to be from the devil.
The Holy Spirit: His mission is to increase your dependence on Jesus and on God's promises in the Scripture. It will confirm something that God has said to you in private. It may reveal personal issues that no one knows about except God, but will encourage you to put your trust in Jesus to work them out. The devil can reveal personal issues that no one else knows about too, but he will use it to further depress and discourage you.
The test of a genuine prophecy is whether it makes you love Jesus more and strengthens your trust in Him, whatever issue that is presented to you in the prophecy.
The true prophet knows that he has nothing except what Jesus has given him. He will strongly discourage any attempt to put his name in lights or for people to have more regard for him than for Jesus. At the same time, he will not show a false humility either. He will be his natural self. He will appreciate positive feedback, because prophets need encouraging too. But he will encourage you to put more trust in Jesus than in himself.
Also, all prophecies, general or personal, should be recorded. Do not trust any prophecy if the person giving it does not allow it to be recorded. You would need to ask yourself why is there a resistance for a prophet to have his prophecies recorded? A genuine prophet would have no hesitation to be fully accountable.
So, with these prophets that visited your church, test them under the criteria that I have proposed, and see what comes out of that.