Navient Debt Collection Complaint

Navient Debt collection department,

Federal student loan Cont'd attempts collect debt not owed Debt is not mine New York

I am being harassed on a daily basis on a debt that I do not owe. I sent them a letter asking them to cease and desist from calling me. I sent a certified letter asking the debt to be validated and they have ignored my requests. They are affecting my credit tremendously with these false accusations.