Benq F5 Android, deleted contact still appear in phone/call app

[AC Question]

I have a problem where the contact was deleted from the address book, so you cannot find that person's name or number at all in the address book, however, when you try to dial the number in phone/call, the contact appear in phone application, that you are unable to delete and when you press the contact, a pop up msg said "contact doesn't exist", how do I delete completely?