Hi parents
I’m looking for suggestion how to deal with the bullies.

My child started Sec1 this year & was okay with his group of peers till recently. Well Boy A & Boy B started to constantly talk bad & isolate this Boy C who is from the same group & even start a groupchat to say nasty things about Boy C. Somehow now the attention turn to my child , A & B started groupchat to talk about my boy - fill with vulgarity . My boy will exit from the group but they keep adding him back into the chat . End up my boy block them. When my boy confronted A , A said they just want to “roast” him , why cannot . Groupchats are fill with quite a number of classmates. Well A & B is teacher’s pet & “ popular” in class.

Well my boy didn’t want to inform teachers , would like to ask parents here could give me some suggestions?
Honestly I cannot stand the bullies arrogant & how they manipulate the classmates .