Evaluation Solutions This company does not pay! Jacksonville, Florida

I have been doing BPOs for this company for the past couple years.  In the beginning after the first few reports I completed for them they paid within 30 days.  Then I had to start pestering them for payments and they got farther and farther apart.  I have orders I've completed dating back to May I am currently trying to get paid for and I get nothing but the run-around and told that accounting is reviewing my account for payment.  I try to follow up and only get excuses from the BPO 'specialists' (if they answer the phone), or get automated email responses that my request has been received by Vendor Management and has been forwarded to accounting.   They do not have a regular payment schedule like other reputable BPO servicing companies.   I kept trying to give this company the benefit of the doubt...but I just want to receive my final check for the work I've done and will not do any more work for them.  I am going to alert all my other Realtor friends and hopefully prevent them from the frustration and non-payment issue with this company.   They currently owe me $330, not a large sum, but the time between doing the BPOs and my collection efforts puts me in the negative with this company.