Facility Source does not pay contractors for successful work completed Columbus Ohio

We were contracted by Facility Source in spring of 2017 to complete Spring Cleanups of 2 Rite Aid locations by a certain date and perform weekly lawn mowings and lot cleanings every other week.  We completed all our duties on time, turned in all invoices, photos of work completed, and signed sheets from the locations managers on duty to Facility Source as they required and we have only been paid for a few lawn mowings. 

They refuse to answer phone calls, emails, and mailings.  As it seems from other landscaping companies, Facility Source has failed to pay other companies too.  About 6 account managers were either fired, quit, etc, in the 4 months that I tried working with them to get paid.  They are also not recognized on the BBB website.  They still owe us over $500 for our services rendered.