To stop receiving notifications for a specific team's chat, load up the Pitchero Club app and log into your Pitchero account.
Tap 'Activity' at the bottom of the screen.
Tap the specific team near the top of the screen.
In the Chat screen, tap the options icon (...) in the top right-hand corner of the screen.
In the overlay at the bottom of the screen, you shall see an option to 'Disable Notifications'.
Tap 'Disable Notifications' where you can then specify a timeframe you wish to disable notifications for.