How to compare and chart due date verses date received using Pivot Table/Pivot Charts

I have a 4000 row spreadsheet and each row contains a date due column and a date received column.

Title Dept Date Due Date Received
Report 1 HR 3/23/2014 2/15/2014
Report 2 TR 4/15/2015
Report 3 BR 12/31/2014 1/15/2015
Report 4 CH 6/1/2016

There is always a date in the date due column and sometimes a date in the date received column. I need to automate the process to supply graphs of the data showing how many reports were due for the month verses how many were received by each department. I also need a running total by month for each department. I have no problem using pivot tables and pivot charts to show the data for date due by department and date received by department. My tables and charts don't work when I try to show both date due and date received. I can do it manually, but I need this process to automatically update so a manual solution isn't going to work. I'm attaching an example spreadsheet and any suggestions would be much appreciated.