PM sending repairs off to his own company for enormous markups!

[Tyler Dunlap]

Hi all, I am furious.  After some investigative work, I confirmed my suspicions.  My property manager has been severely overcharging me for repairs for months.  Like ridiculous markups.  As it turns out, this guy OWNS the company that performs the repairs.  Clear conflict of interest, obviously more interested in charging me for repairs to line his own pockets than to care for his client.  Is this illegal?  The property and company is in Illinois.  

Any advice is appreciated!!