Arc cannon what the heck is up??

So me and some friends were playing last night had a full team we never get beat "well hardly ever". Other team were all using arc cannons and goosing us when we were not even 10 ft above our titans. Obviously there is some cheating going on. No matter what they were always dead on. Also people using charge rifles and shooting us all the way across the map while we were running. This was happening consistently. Fix the arc cannon hack **bleep** or I'm never playing this game again!!!!