Cannot delete BootCamp through BCassist or Terminal.

I was trying to install windows by BootCamp, but it crashed in error saying "The startup disk cannot be partitioned or restored to a single partition. The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows."

So left the idea of installing windows on Mac alone. But in few days I've found that my SSD is partitioned on Mac and Bootcamp. So I tried to delete it through BCassist and through terminal from this topic:https://discussions.apple.com/thread/7784222?answerId=31095048022#31095048022

But when I am trying to delete it, it always showing me that bootcamp is still on my ssd using my capacity. HELP PLEASE.