Caller ID

I have a Panasonic KX TGJ320E cordless 4 handset phone, and all of a sudden my caller ID does not work, have unplugged checked batteries tried in different phone and electric socket, contacted my internet supplier and still not working  Also suddenly appears on one handset at the bottom of the screen a number '4' in a black square next to it says Handset 4, never seen that before.
Would really like some help.
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