I can't leave my league and I can't get rewards

It's a known issue, keep an eye on this thread, no ETA on fix AFAIK

Problem :[Error 30000] | EA Forums - 12277862 

I would be happy if it gets fixed soon

problem not fixed

It has been going on for months, so follow my advice: when you get pinged by EA staff, DM them your UID so they can try to resolve your issue individually. 

ÜMİT_ALGZ

my game name

Customer service can't solve my problem. How can I fix it?

It's been 2-3 weeks and the error continues and no one has been able to solve it.