Aargon Collection Agency Inc Claimed a debt on my credit report that is fraudulent. Damage to credit Las Vegas Nevada

I had a bill with Western dental for 966.00 which they violated when they sent the bill to collections,  Which i thought.  After being denied rental locations i pulled my credit.  I saw that there was a bill for $2033.00 (Which is a fraudulent claim) and an open for 966.00.  When i called Aargon they said it was for the balance of the contract.  Not for the work i had done.  Since the 966.00 was the balance on the work done.  This collection is fraudulent.  The person i spoke with told me i needed to read the contract,  but would not inform me of what the bill was actually for.  When  i called Western Dental the informed me that they only had one bill and that was for the 966.00 nothing else was owed.