Is the chatter saying anything bad?
My general rule of thumb is: try your best to block out the chatter if it's nonsensical and random, but if the chatter turns into a conversation with you (e.g., you and the voices are talking to each other) or the voices are suggesting you hurt yourself or others in some way, then you need to tell someone ASAP. Also, even if the voices aren't harmful in any way, if they're bothering you, you really should tell someone because that can stress you out, and stress can make things worse.
I tend to hear random words on a near daily basis. For example, "Bob car frog that it was were is cat." I block those out with music, TV, YouTube, nature sounds, etc.. Just gotta find one sound to block out the other, I guess.