LabCorp Grossly overcharged for lab services Internet

 I recently had a full metabolic panel done through LabCorp.  My insurance will not pay for it as my benefit for this service is used up.  The bill is for $2167.00.  They agreed to discount this to $1300.00.  The contracted rate from my insurance plan for the same services is $345.98.  They are charging me four times the amount they agreed to take from my insurance carrier.  I have been told there is nothing they can do.  When I asked how they justified charging a client four times what they charge an insurance company I was told it was company policy.  Soon I will be going in to collections.  This is utterly ridiculous.  They are taking complete advantage of their clients.  Their actions should be illegal.