Navient Solutions, Inc. Student Loan Complaint

Navient Solutions, Inc. Student loan department,

Non-federal student loan Dealing with my lender or servicer Trouble with how payments are handled Illinois

I sent Navient special instructions ( through their website email service ) on how I want my payments applied to my student loans. The response I got not only did n't confirm the usage of the instructions I provided but also told me the only way to have those instructions applied is to send in a check with instructions every month. Does Navient have to apply my special instructions regardless of the fact that they were communicated via email? And why do I need to recommunicate them every month - and why is it somehow not applicable to my autodebited payment?