First off, you're not going to get an Instant Feedback Report every single time someone you report gets punished. It's extremely rare, and it's not a good source of info as to whether or not someone got punished.
Just because you're not being directly told that someone got punished doesn't mean they didn't get punished.
Second, provide your chatlogs. If you got punished for telling your team to mute others, it may have been an issue with your delivery of those statements, or you could be deliberately ignoring other negative chat in your logs and focusing on that to try and present yourself as innocent.
Without your chat logs, we on the forums are disinclined to believe what you say. It's nothing against you, just that we can't take a claim at face value without proof behind it.