Un-deletable Message

I have a SAmaung S3 GT19300 phone runnuing Android 4.3.

I received a text message from Three Mobile and i tried to reply but when I do I get the response "invalid recipient"

As the message wasnot behaving as expected I tried to delete it.

Using "Discard" I fin the nothing happens and the message is still there

How can I get rid of this message?

I have no trouble deleting other messgaes!!!

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