Can anyone explain to me why I got this special 12 badge?

That's your tenure. It's how long you've had Gold. They updated the look of it for the 20th anniversary.

The badges and icons you are seeing are explained
HERE. There are some badges that are special and not explained. If you have any other questions please don't hesitate to ask. Thank you,

It won't let me sign into my account either. I have tried for the past three days to sign in. and it keeps telling me to sign in and manage my account I wish this would be fixed after I got my bronze badge that I got 12 bronze badges it will not sign me
in. I hope this will be fixed soon.

It does seem odd that you were banned for that...presumably it was an LFG for Apex? Looking for Diamond 3 and higher players? Maybe highlighting being a previous Predator level player?

Of course, we can speculate all day here but we have no way of knowing exactly why they deemed it inappropriate

If that's what the enforcement team put, then that's what you were suspended for.