ABC Process Service Failure to pay for services Dallas Texas

I am a certified PA State Constable, I was contacted by ABC Process Service on November 13, 2014, to serve a legal document for them in Athens Pennsylvania.  The rate of service was $65.00.  I was then sent a 66 page document which I had to print off plus I was asked to send back the origional signed return of service. 

I had to add in the cost of printing and mailing, bringing the totol invoice to $71.00

After two weeks I still had not been paid, I contacted them and was again asked to send another invoice, I did.  after another week and a half, I called and spoke with a person who said that payment would be sent right out.  By Christmas eve I still had not been paid. I called early in the day and spoke with a person who claimed to be the owner, when I stated what the nature of the call was, I was told he wasn't discussing open invoices and he hung up on me.

I have tried to call since then and my calls go straight to a voice mail as though my number is blocked.

It is now January 7th, 2015, I served the document for ABC on November 14th, 2014, they have had more than enough time to pay for my services.