National Telecom Services Non Payment for Sub-Contracting Pittsburgh Pennsylvania

My company was contacted by National Telecom Services to do work for there out of state customers located in Indiana. After doing serveral jobs for this company, my company has not been paid. I have contacted there Accounting Department on several occasions, and they inform me that they will look into this matter. 

I would like to inform other Sub-Contractors to beware of this Company, because it is very clear that they do not pay there Sub-Contractors.

I will continue to pursue this matter, and take all necessary actions to recover this debt.