Who called from 9044006602

Another "NSCJX" number.  No idea why I would be getting it.  Also received from 904-345-3462 and 904-309-6389

In case anyone reading isn't aware, these numbers call, and if you answer they say nothing and the line goes dead.  If you attempt to call back, you get an error message that the number is not in service, or you are calling from a restricted handset.  Following that, a female voice says the letters "NSCJX", and the message repeats.

Tired of these calls from that 6602 number. So much for blocked callers!