But you must have any kind of an accusation for him/her. By just saying that he/she creates many games at the waiting room and that 2-3 people saying that he/she resigned a game against them is not enough i think. It must be a repeated process For example if he/she does this again..... Don't forget that the person may had a reason(a real one) and now he is again fine.
It happened to me 2-3 days ago and i'm still wondering why he/she did that. And the worst part is that person is strong in some games while it is very interesting to talk with and his/her behaviour was not strange at all before this. Now i have accepted 2 more games with him/her and i hope he/she will not resign....