iPhone contacts goes missing randomly
About 2 months ago I noticed that one of my contacts went missing on my iPhone. I did a full restore and it came back. Today, I wanted to add another number to this contact, and yet again this contact is missing. I did not delete the contact. I know I can restore to a previous version but that will overwrite any new contacts I've added. The contact in question is called "Spam Stuff" and contains lots of numbers. So either this is a bug that delete contacts with lots of numbers or I have a different application loaded that will delete this contact. The only software installed that could do this is TrueCaller, but as far as I know it is not allowed to delete contacts. Please assist in a way I can restore only that one contact and not overwrite all my contacts.