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when you join a server youre prompted to agree to the rules in this popup, if you dont you wont be able to chat and if you exit out of it you should have a banner like the second and third image below, make sure youve verified yourself or check to see if maybe youre muted.
Unless you only used the mod menu in LAN mode you'll be banned for using whatever injections you used even if its just in a private match, and it literally says "any attempts to bypass will result in further punishment" so obviously your ban will be extended if you try and use another account to bypass the ban, and plus I'm guessing you also did so on the same IP address so no shocker there.