How do I get a refund

The last update killed this game, I play controller, yes we get a little help from aim assist, well I don't get any, also I'm still using a full clip just to kill people, sick and tired of watching my bullets go through players, I use to do 40+kills games, barely coming out positive, low ranks, are they buffed?? Why can they kill me with a SMG at 90+ms away while I'm hitting them 40/50times with a LMG, this game is cooked, I'm so close to deleting it