Navient Debt Collection Complaint

Navient Debt collection department,

Non-federal student loan Disclosure verification of debt Right to dispute notice not received New Jersey

I have not received any mail or calls from the lender since -/-/- when it was charged off my account. Then yesterday a collection company called my cosigner and asked for a payment of $4000.00 toward a debt from -/-/- of $14000.00. The collection company also told her that by paying $4000.00 her financial responsibility as a cosigner would be removed. I have not received any notice of right to dispute, nor was it mentioned in my call today. As far as I was concerned this account was charged off and it does n't even appear on my credit report.