It is not a valid service,
1) It is not possible person check every msgs from unknown numbers
2) If he/she cannot chek Whatsapp during the service period of summons, then we can't says that he refused the summons,
3) It means summons send by text msg and pic msgs, and through E-mails (electronic/online Media) )are also valid.
Such summon can not ba valid unless copy of the order is received.