Can i get banned for not communicating through words.

I don't think so. I am pretty sure that when you get banned for Flaming/Toxicity they just look at the logs and then they decide. So in my opinion if no words are said, you should be safe.

To the best of my knowledge, you can communicate through pings without typing and have it not ne considered "failure to communicate with teammates"

No, they removed "Failure to communicate" as a report option some time ago. Even when they had it, I think they said they never actually banned for it.

Chat penalties are related to what you say in chat. If you say nothing, there is nothing to punish.

Good luck, and I hope this helps you get back into good standing.

There is no requirement that you communicate in any way. You don't even have to ping if you don't feel like it. You will not be punished for opting out od communication.

I've rarely typed while playing this since preseason 1 and never gotten a punishment or even a complaint from a player for just using pings. As long as you are cooperating with your team there shouldn't be an issue.

No it's actually a good idea. Pings suffice.