Sorry to disappoint you but I will not be renouncing anything ... God has used me to instantly heal the sick since that prophecy ... not every one has been healed ... but the bible does not anywhere say as a Christian God will instantly heal every person. When listing the Spiritual gifts the bible says "some have the gift of healing", others "a gift of unusual miracles", there are levels in the Spirit and God give a measure of His gift. No one Christian will be operating in 100% healing or miracle power.
If you have had a prophecy that God is giving you a gift of healing, that prophecy is equal to Scripture because God is purported to have said it through that minister. If God really did say that prophecy, then you should have the gift of healing so that every person without fail would be instantly healed when you minister the gift to them. If a healing happens just once in a while, then you don't have the gift of healing and the prophecy is false.
God does not give a gift and then take it away and then give it back again. The Scripture says that the gifts and calling of God are without repentance. If God gives you a gift then you have it and it is not withdrawn. Therefore, every time you minister healing, the gift should flow out of you. If it doesn't every time but just once in a while, either God gives it to you for a couple of healings, then takes it back again - which is contrary to His nature - or - He never gave it to you in the first place, and therefore that prophecy did not come to pass and therefore was something the minister dreamed up out of his own head.
If someone was supposed to have the gift of prophecy, or the word of knowledge, and it was true only once in a while, and the rest of the time the prophecies were not true, would it be common sense to say that the person does not have the gift of prophecy.
In actual fact, the spiritual gifts are not given to individuals for their exclusive use. They are given to the body of Christ and the Holy Spirit manifests the gift through His chosen person at the time. And it may not be the same person every time. I firmly believe that in the instances where you ministered healing and the person was instantly healed, the gift of healing did manifest through you, but it was not yours to keep, and it remained with the ownership of the Holy Spirit.
So, the original prophecy that God was going to give you the gift of healing as your own for your personal use, is not Scripturally correct, therefore was totally false and was either from the minister's own desire for you, or from a divination spirit.
But a prophecy that stated that the Holy Spirit was going to manifest the gift of healing through you as He wills when the time is right and that you should prepare yourself by waiting on God in prayer and in His Word, I would be able to acknowledge as Scripturally correct, and has been fulfilled through your ministry.