Nationwide REO Services Vantage Management Systems Agreed in writing to pay a certain amount for services performed but never did Baltimore Maryland

Nationwide REO Services which is owned by Vantage Management Systems hired our company to complete yard maintenance on foreclosed properties they managed.  We completed approximately 20 jobs before any of these started to show up within their invoicing system.  I was very upset to learn they were only paying us $20 per property no matter what the size or height of the grass.  

Before anyone tells me I should have reviewed their pricing structure beforehand - I did.  It said that they paid between $20-$40.  So I thought this meant $20 for the smaller properties and $40 for the larger ones, which seemed to be the bulk of our work.  It was explained to me by Beatrice that $20 across the board was standard for this industry.  I'm guessing she wasn't aware that this wasn't my first rodeo.  I politely let her know that this wasn't true as we had completed the exact same work for other companies, but earned 3-4 times as much as this.  I never heard from her again.  

Not only did we never hear from any of them again, they decided to only pay us their standard $20 fee for almost every job completed.  One of the jobs was over 10,000 square feet and the grass was 14 inches high, so before starting, I called them for prior approval of a $60 fee, they agreed and said to email them so I could have this in writing, which I did.  Kim emailed me back telling me it was approved.  There was also another 5 properties they agreed to in writing that they would pay $30 apiece for this one time.

I realize that this is only a little over $100 that we weren't paid, but we're a small struggling company that needs every penny it earns.  If a company agrees to pay you a certain amount for services performed, they should honor this agreement. We worked hard for this money and deserved to paid.