How do I delete duplicate contacts on android EMUI 10? They keep reappearing.

[Dusk Fall]

Do you have any ideas on how to consistently delete duplicate contacts on android? I don't know why this is happening.
My guess is because I have some saved on SIM and some on the device. If I delete them all of them reappear again in the next few days.
It's really infuriating

 

[mustang7757]

In contact app it doesn't have option to merge duplicate? Can you choose show contacts only from say Google account or another account?

 

[B. Diddy]

Go to Settings>Accounts and see how many different accounts are set up to sync Contacts. If there are a bunch, try turning Contacts sync off for accounts that aren't crucial.