RP rules violation

[Third Eye]

I believe using name tags for RP is against the rules, yet it has happened.
While outside of the town Solitude (An enemies town and I have been here previously), waiting for a safe time to go in I was discovered by Nlewis and Pwolbart (Not sure how to spell his name) (Also Ian but that is later) .
Please note that I was sneaking and in a cave.
They found me by what I believe using my name tag.
The first was Ian, he had to break the wall to get to where I was, and reported my position. He couldn't have known I was there without using my name tag.
Then I went back and went closer to the town.
Shortly after (Still sneaking at this point) I noticed a high level of danger and attempted to leave.
Then Lewis told me to stop (I THOUGHT they would be peaceful as I haven't taken anything and I actually wanted to talk to them) so I did and told them I was on my way out and I wanted to talk.
However Pwol makes a straight line to my position and kills me.
I did have armor on but I didn't have my sword drawn.
I was given no time to leave nor time to explain myself.
(Going off topic) I also believe that Giratina has also used name tags for RP.
I will also say that I broke blocks I think were placed by another player but could not replace them as I was killed.
Even while sneaking they saw my name tag and used it to find my location.
With my current knowledge, when a player is sneaking you cannot see their name tag through a one block wall of some sort without the aid of a hack client.
I will also inform you (Since this post is non-RP and I can use name tags to explain) their name tags were small enough to see that they were inside city walls, and their positions were inside the walls as well.
So, even without being in a cave they couldn't have seen me and couldn't have done anything if I was not crouching.
They didn't even pull the "I heard him breathing".
They just went and killed me, after telling me to stop.