How can I get rid of duplicate contacts

A

AC Question

Hello

On my Samsung Galaxy Note 3, all my contacts have been duplicated.
Some are x2, some x3, some x5.

I have already tried deleting all my duplicates, but suddenly they are back again.

For what it's worth I have on my Galaxy Note 3 smartphone the following:

For email I have: Outlook, Nine.
For instant messaging I have: WhatApp, Viber, Skype, Twitter.
I also have Facebook and Gmail although they are not supposed to have access to any of my contacts.

For calendar on my phone I have DejaCalendar which I sync to Outlook365 on my Windows10 PC using CompanionLink for Outlook. My Outlook on my two PCs using a hosted version of MS Exchange

But whenever I go into the official "Contacts" (orange button), and whenever I try to send an SMS, and whenever I try to make a phone call... there are all these multiples of every contact.

It's a total nightmare.

J