Punishments follow a 4-strike tiered system:
1st strike: 10-game chat restriction.
2nd strike: 25-game chat restriction.
3rd strike: 2-week ban.
4th strike: permanent ban.
Whenever you receive a punishment (regardless of severity) you will always receive the next one in line. That being said though however, it is very much possible to skip tiers altogether and go straight to a 2-week ban or a permaban if the case in question shows extreme toxicity (i.e. death threats, racist comments, intentional feeding/afking, intentional gameplay trolling, etc.). By showing enough of a reform effort though (~3 months time) you can actually drop down tiers and receive a lesser punishment should you ever be punished again.
You say that you got banned, which means that you most likely have received at least 35-games worth of chat restrictions before-hand. If that's the case then this is your final warning before you get permabanned. Now if you would like to discuss your ban then please post your entire unedited Reform Card here (check your email/spam folder and game client for it. The game client contains up to 3 games while the email only contains just one).