AutoCAD 2010 :: Update Block Attributes In Drawing From Excel Spreadsheet

I have a basic floor plan in AutoCAD 2012 that has blocks in specific locations which contain personel data....name, phone, computer tag, desk key numbers, etc.  I extracted the data to an Excel spreadsheet and I thought set up a "data link".  But I don't know how to make the data update.

My problem...moves of staff, phone, computers are often made, but no one lets me know about it until they want a new floor plan printed and the computer and key tags get so messed up from the moves that it can take me hours to fix.

My goal is to be able to have our secretarial staff update the spreadsheet and in turn update the blocks in my AutoCAD drawing when it is opened and/or "updated".