Been working since October to pay off a loan for m...

Been working since October to pay off a loan for my dead friend's estate. PHH will not send documentation to allow her son to work with them, get information on the loan, including pay off amount. He has sent them checks, both personal and bank checks, for a lump sum to pay this debt and they have returned and/or destroyed all of them, refusing to accept more than the monthly payment from him, yet failing to send documentation for him to fill out that would prove he now is in charge of her estate. He has the legal right to pay off her debts. It's insane. THIS IS A PREDATORY COMPANY and shouldn't be allowed to operate.