Look, where?

I hate it when people greet you on the PHONE with "Look".

- Hello, it's Dr Kien ... How can I ...
- Look, I had an appointment earlier tomorrow with Dr Sonso. Blah, blah... .

How can I "look" when my only sensory apparatus for communication with you is an auditory one?

Being rude is one thing, but asking me to use my ears to see is beyond me!