"One never notices what has been done; one can only see what remains to be done" - Marie Curie
You're always working, working hard at work, taking care of those calls, dealing with those customers.
Yet whenever your manager sees you, it seems like you're not doing anything? Sound familiar? It seems that there are so many times that you complete so many tasks, yet all that is seen is what you still need to do.
They always catch you at the wrong moment, when you are taking that little break just to check your phone, your mail, etc. The focus should be what you have done and what you will do, but sometimes it seems that that is never really seen.
So what do you do? Documenting your tasks doesn't seem to be the answer? What else? That I don't know the answer to, but please feel free to share your thoughts if you do have some suggestions.
I believe what you can do is manage the perceptions on as what you are doing and what you've seen to be doing is important. Hopefully that's enough and you can still have those short little breaks in-between your busy schedules!