Problems with my texting chato

I was testing some macros in my campaing, learning some stuf, and in some moment my chat stopped working. It's not sending any new message. I tried to clear de messages historic and it cleared the messages for a moment, but when I try to send a new message, the entire historic of messages come again, like I didn't clear it. I really don't know how to solve it

Clearing your chat in game just clears what you see at the moment.  To actually delete stuff that has corrupted your chat somehow (which is what this sounds like), you need to go to the game details/launch page.  The settings button has several options including Clear Chat Archive.  Make sure you don't click on Delete Game by mistake.  Both of them ask for confirmation, but that mistake has been made before...