First the captivity, is defined as "the period from the fall of Jerusalem (586 B.C.) to the reconstruction in Palestine of a new Jewish state (after 538 B.C.)."

The Babylonians, under Nebuchadnezzar, after twice laying siege to Jerusalem, finally captured it in 586 B.C.E. Nebuchadnezzar's army then pillaged the city, destroying the Temple and sending the inhabitants off to exile in Babylonia.

In 587 Jerusalem fell and numbers of its inhabitants were carried away captive to Babylonia..." (Unger, Merrill, F., Unger's Bible Dictionary, Moody Press, Chicago, 1966, page 782).

Notice that the year 587 is offered instead of 586. There is sometimes a difference of opinion as to which year is the exact one. Nevertheless, it is obvious that 607 B.C. is not even close.

Then you have all the "prophecies" made by the watchtower, and jw’s that have not come true……

How does the Bible say that we are to identify a true prophet?