When a JW tells you that, show them this:
JUNE 15, 1964 Watchtower
As Jehovah revealed his truths by means of the first-century Christian congregation so he does today by means of the present-day Christian congregation. Through this agency he is having carried out prophesying on an intensified and unparalleled scale. All this activity is not an accident. Jehovah is the one behind all of it.