Nationstar Mortgage Mortgage Complaint

Nationstar Mortgage Mortgage department,

FHA mortgage Loan servicing, payments, escrow account Arizona

NationStar Mortgage Company claims that I missed a payment in -/-/-. I called NationStar on -/-/- at - and spoke to a lady by the name of -. I asked her to tell me what month and year was this supposed missed payment. She told me it was the - - payment that was not paid. I said if I could prove that it was paid, would I be reimbursed for all the late fees? She assured me that I would be. I have proof of all my payments including the one that they claim was not paid. I mailed the proof to NationStar -/-/-. They have never acknowledged that I have provided the proof of payment. Every month they accuse me of being behind in my payment by one month on my mortgage bill. They also add late fees and ask for the missing payment which I do not owe. They are ruining my credit rating.