Some questions about a 2 week ban 6 months ago.

Hi, around 6 months ago I received a 2 week ban. I argued and while I don't think what I did was ban worthy, I'll admit I definitely wasn't being a good team mate. I was having a bad day and ended up having 2 games back to back where I refused to play with my team and told them I'm only playing for my self. I never said anything racist, homophobic, or threatened anyone with violence. Anyways, that was 6 months ago. Since then I have not received a single warning let alone a chat restriction or ban. Yet, even though I've made huge improvements with how I talk to and co operate with my team mates I still am locked out of receiving chests and rewards. I was wondering if 6 months isn't a long enough time to reform in the eyes of the system, how long is? I really want my end of the season rewards this year. I've worked very hard to reach Plat, and I've also worked very hard on my attitude towards players who troll and bait me into arguing.