Are you using a non stock messaging app like Handcent or Chomp? If so you will get double notifications if you didn't turn off the stock messaging notifications. Open the stock Messaging app / Menu key / Settings / uncheck Notifications.
If it's not notifications and you are getting duplicate messages, that sounds like a carrier issue. Contact your carrier and explain whats happening.
I tried this with a galaxy s3 with new 4.3 update, when I disable notifications on the stock app, i get no sound or led light notifications with handcent.
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