How to know who reported you in a group chat and got you banned

Unless they tell you, there's no way to know who reported you.

Yeah maybe some people from the group chat also reported you for some reason i think thats why you got banned twice

I just got banned on the 20th for sending a messages to one of my buddy’s as a joke and he knew i would get banned so he reported me, it was in a group chat, and after that i have not sent any messages, and nobody has reported me?

" wait it out and try not to say stuff like that unless you're with like minded people i.e. people you trust not to report you for a 'joke.' "

The people in the group chat and the people i speak with talk weird like that most of the time and iv'e seen the same people say weirder things then this, im certain that the people in the chat didn't report me and almost everyone in the group chat was playing
along with stuff like "OH [mod removed] YEAH" and stuff like that, i would like it to be checked out on who actually reported me so i know who i should say stuff like that around, thank you for the info and have a great day (btw how can i find out if im eligible
for a case review, just wondering and again thank you for you time.

You can also try using this link Find out why your account was banned

Maybe it'll give you a clear indication what happened or how you got it. But communications bans are generally because of you being in a party chat, or messaging someone who reports you for something offensive.