From Slack, in the direct message with todobot, please type the word settings and click the link that appears from the Bot
This will open up the Settings page from Workast where you can turn off all your notifications
Settings page should look like the below if all the notifications are turned off.
Be sure to turn off the daily reminders as well. All of the switches should be pointed to the left under Daily Reminders
You will not receive any messages from todobot, unless you talk to the todobot through a direct message.
In this case, you may receive an auto-response from the bot.