Senior Helpers

I was hired by Senior helpers July 2015. I was sent to work two cases, which I was NEVER paid for. After these two cases in the month of July I have not received work although I have called continuously for months to inquire. Whenever someone decides to answer their extension the call is being directed to someone who is unavailable. I've tried contacting the HR manager by phone and she told me this was an issue for the coordinating staff whom in turns told me this was an issue for HR. After leaving messages that have gone unanswered, I'm hoping to find some sort of resolution.