Authority tax services Dont use their services Irvine, California

In Nov 2013, i contacted them for help with my tax debt.  Over the phone they have assure us that they can help us reduce our debt but cant tell us how much but more then what they will charge us of $2500.  After 2 months and pay $1250, they told us the irs refuse to lower my bill and want us to fill out a form to setup a payment plan.  Then we contacted them by email about this outcome and how they say they wouldnt take my business if they cant help us or even charge us that much for their services.   All they wanted to say was for us to read their contract and that they did their job and want me to pay them the balance.  Til this day, they still call for their payment.  We told them to do what they said they will do and we will be glade to pay them.  They said it was the irs not welling to help and not their fault.  Plz. Dont use their service or get a voice record on every word they say over the phone.