How?
As per your story you only saw his warns because you misclicked and hit his name and not the person you are actually dealing with at that time. Then you went out of your way to get a SA+ to punish a player who just happened to suffer the misfortune of you clicking on his name with a 6 hour minge with no indication if he was actually causing trouble.
Also just something to consider, on every 10 warns you get banned for a certain amount of time so technically he would already have been punished for his 30th warn. So I think your actions werent professional and perhaps you should get a talking to.
Also how do you know for sure that he wasn't already punished for having 30 warns. This is a lot of grey area and perhaps only punishing him for actually receiving a warn from you would be better than receiving a minge out of the blue.