Updating AD users information from a CSV file.

Hi,

I have this Excel file with a list of telephones, names, departments and titles which is distributed and updated by the HR department. 

I want to use import-csv to update the Telephone, Department and Title in AD, however I am kind of new with PS. I know how to do it when the columns are named exactly like the field names in AD, but they can't be named like that by the HR.

Please help :)