Hi! There's quite a few threads, just like yours, on this forum with the same issue & im sure you would find the answer you're looking for by going through them!
There's normally added a chatlog of the game you decided to act against the terms. These are very helpfull for us to reason with you/ give you an idea of why you were banned/ our thoughts in general... or in this case why you haven't been given any warning(s).
Honestly, in my opinion, we shouldn't be given any warnings for our behavour as we know whenever we're being toxic or disgusting. As I've mentioned in previous posts- it's not always that one specific game, but sometimes the amount of games you're being toxic. **You're being constantly toxic, while the other player(s) in your game 'rarely' acts that way. **