Your opinion of the rules is of zero relevance. When a cop stops you for going 40 in a 25 zone, you can claim "I think the limit should be 45 here" all you want. You're still getting a ticket. If a librarian asks you to keep your voice down while you use the facilities, shouting that libraries should be loud will simply get you escorted out. If you go to a friend's house who insists that you remove your shoes while you're in their home, "that's a stupid rule and I do what I want" will lose you a friend. If you are using someone else's services, facilities, equipment, etc., you abide by their rules or you deal with the consequences. If you think the rules should change, that is a completely different conversation (and I wouldn't give a plugged nickel for your chances at convincing Riot to change their rules to allow behavior like yours).
From Riot's support knowledgebase:
We work with the overall community and within our own company guidelines to identify what disruptive behavior is and what the consequences for those behaviors should be. We understand that it can be difficult to know where the line is, which is why we provide chat logs and we have a few tiers in the ban process in order to allow for you to learn and grow.
Riot's punishment system used to hand out stacking chat restrictions, such that consistently toxic players basically had a permanent chat restriction. Unfortunately, it turns out that such players used their few chat opportunities to be toxic, and, when they couldn't be as toxic as they wanted to, they resorted to committing non-chat offenses such as griefing (following someone around and taking their farm, using wall abilities to interfere with their play, etc.) or inting. The purpose of the punishment system is to eliminate rule-breaking, not make it worse. Thus, if a couple chat restrictions don't make any difference in a player's misbehavior, the system ramps up the punishments until the player is permabanned and thus unable to use that account to break any more rules ever again.
Did you find something in Riot's store allowing you to break the ToS? No, because such a service is not offered. Regardless of how much money you spend, you are required to follow the same rules as everyone else. If the IFS determines that you've been validly reported in violation of those rules, you'll be punished according to those rules. If you wanted to avoid a punishment, you should've followed the rules.