How to remove snatchbot from my facebook page.

Hi there,
I'm trying to turn of and remove my snatchbot chat from my facebook page without success.

I've followed your steps to remove it from the channel setting but it still showing on my facebook page.

Please check my screenshots:

as you can see in the third image link I'm not able to change or disable any status of snatchbot 394353490931600 and the chat.

Could you help me?
Thanks