What nonsense is this? Why my friend cheat i need to get effected? What happen if i press confirm?

this is not nonsense is normal, in open competition any 1 in a group or party is found cheating whole group will be punish. i don't think u read the rule and regulation properly before the game. by the way this is just a notification, this tell you are punish so choose your party member carefully in the future.

lol, so what's ur punishment?

Nothing. Just a warning saying he got banned so most xp or item that came while playing with him is removed.