With the mobile MSPMANAGER app, I think it would be a good idea to add a signature page for completion of tickets. Rather than just word of mouth when a ticket is completed, you could have the clients signature as proof of completion. You could have a separate button, tab, or when you select the complete option a pop up could show requiring the clients signature for proof of completion so there's written documentation inside the ticket that the work was completed and that they are satisfied with their services.