suspect it may be falling through a "best guess" type filter, and the default meaning assigned is "phone number". then some other system decides if you're looking for "phone number" but doesn't have anything else to work with, gives you a suicide hotline.
Probably really involves a dozen more layers all run by people who never talk to each other.
"1236 800", "1236 + 800", etc. also do it, but 1236800 does not. The two numbers have to be separated and in that order.
It'd be interesting to know why.