ID issue - legal representative

amazon is asking me to send them a letter of authorisation for the legal represeantive. There is only me in the company but they insist i send it after several attempts of asking htem if the account has been set up correctly.

So it seems I have to write a letter to myself, authorising myself as a legal representative.

To me, this is illogical, inappropriate business activity. And contrary to what they tell me, it is no a legal requirement. The letter is in fact complete nonsense.

The chat and email responses are horrifically unprofessional, always avoiding answering my questions. So I do not really trust their confirmation that it is necessary to write a letter to myself, auhtorising myself. Furthermore, they refuse to telephone me so I cannot really pinpoint my concern. And my concern is this:

have I in fact set my account up incorrectly for there to be such a ridiculous demand?