I recently tried to delete a contact and the response was
"You cannot delete read-only contacts" you can only "Hide them"

Here's a solution,

Download "easy contacts delete" from play store, open the app and select the contact you want to delete and click on delete. It would be deleted from your contacts.

Thanks I will try

You don't need an app just Google (Google contacts) login and delete the contact that's all...... The contact on your Android is a backup of Google contacts