La fonction de suggestion automatique permet d'affiner rapidement votre recherche en suggérant des correspondances possibles au fur et à mesure de la frappe.
I'm not familiar with the WhatsApp integration by Niswey, but according to their documentation you should be able to receive and record all incoming messages automatically. I'd recommend reinstalling the integration first, but if that won't help, you can file a support ticket with Niswey here.