Yes, Pat Robertson made several prophecies that didn't come true.
These included saying that Trump would win the 2020 election, Russia would invade Israel in 1982, and very serious terrorist attacks would occur in 2007 in the US. But none of these things happened.
The Bible says:
"When a prophet speaks in the name of the Lord, if the thing does not come about or come true, that is the thing which the Lord has not spoken. The prophet has spoken it presumptuously; you shall not be afraid of him." (Deuteronomy 18:22)
So Pat Robertson was not a real prophet. He was a false one.
He was also the founder of the 700 club and CBN network.
These are popular TV programs. Should a Christian watch these?
We do not judge Christians who do. But it's better if Christians don't.
In fact, we recommend that (if we know something originates from a false prophet) we abstain from it, especially if truth is mixed with falsehood in a subtle way.
So since we know that the 700 Club and CBN was founded by a false prophet, and that false prophet holds to charismatic doctrines (which have many problems, see articles below), we do better if we abstain.
https://www.gotquestions.org/700-Club.html
https://www.gotquestions.org/Charismatic-movement.html
Because false doctrine can be very subtle, it is better to not play with fire.
As Proverbs tells us:
"Can a man take fire in his bosom
And his clothes not be burned?
Or can a man walk on hot coals
And his feet not be scorched?" (Proverbs 6:27-28)
I don't think any of us can say with certainty that we can distinguish truth from falsehood so well that we would never be deceived, even if we watch something questionable. So it is better to avoid things that could possibly deceive us and lead us astray.