As a customer, I must be informed when the messaging service is not available, So that I know I will have to try accessing the service later*Given* I have navigated to Menu screen and Kill switch is activated*When* I tap the call to action "Chat with us"Then a screen is presented as below informing me the unavailability of service with the txt on screen as "Messaging service is currently not available, Please try again later"and_User is able to view the Navigation bar and navigate to the options in the navigation bar.