My phone contacts reduced from 2000 to 345 without any actionI lost my contactsHow to regain

Half of contact name do not appear on WhatsApp business application. They appear phone No. Only.I can not add to contact or vise versa choose WhatsApp from contactWhatsApp application send to me " can not update read only contacts" I can not send W...

الموبايل sam 31Aمش بيفتح بعض البرامج اللي كنت بستخدمهاوشوية شوية البرامج ده بتزيدبدأ ب pdf reader شوية ببرنامج إسلامي بعدها برنامج notes وهكذاالرسالة اللي بيجبهاGoogle services keeps stoppingمش فاهم ليه وفي ايه