Bad messeges watsup groop .how to take actions?...

Please kindly be noted that, according to your inquiry, if it is intended that you receive bad messages on WhatsApp, the matter is considered a punishable crime by law, so you can file a complaint before the electronic prosecution in the Sultanate of Oman or at your place of residence with a copy of these emails attached Or by submitting a complaint electronically via this link: Submit an electronic complaint 
Regarding the penalty, Article (328) of the Law on Combating Electronic Crimes imposed a prison sentence of no less than ten days and not more than three months, and a fine of no less than one hundred Omani riyals and not more than three hundred Omani riyals, or one of these two penalties if The slander or insult occurred in the face of the victim without publicity.