Some Guy Trolled Me Really Hard - Fake Ban

So I was playing a game and I get a message in chat that goes something like this:

"System Message: Due to player judgement your account will be permanently suspended after this game"

I kind of had a heart attack and both me and my brother were extremely confused. The message looked extremely legitimate being in yellow text and not having a From: before it. Only getting out of the game I found out that the summoner "*****" on the NA server trolled me by sending a message that looked like this:

hi

Just imagine a LOT of enters here.

System Message: Due to player judgement your account will be permanently suspended after this game

I tried to recreate all the enters but I couldn't. I'm assuming he was using invisible characters. I messaged back "you're a real jerk" and then blocked him. Remember, if a summoner named "*****" on the NA server friend requests you, decline it. It'll save you a lot of trouble.

I'd like to hear your thoughts on this.

THIS IS NOT A FICTITIOUS STORY THAT I MADE UP. THIS IS REAL.