who do i contact in regards to being banned?

Im in this wierd spot where i was banned for a 2 or maybe 3rd time and i forgot how long it said it was but its been a day later and it lets me go into the multiplayer but then it doesnt connect me to anybody or any games and i thought it was the servers were down but my other account it finds me games right away its strange any ideas

having same issue, did you get any help? its a bloody joke! let me know please how you get on. Thanks Ali