I will add to the fun by saying that I DID identify a discrepancy - after splitting a reservation , cancelling, rebooking and the other occasional insanities involved in trying to book using the late stay discount I identified that the 'manual adjustment' that had re-instated a booking incorrectly cancelled by CS had been added in at full points cost despite being booked at less than 60 days out.
What is more worrying is that the first time I raised this, it took perhaps 2 hours with escalation and supervisor to get someone to understand and acknowledge the problem... He seemed genuinely surprised and said that he had never seen an issue with a 'miscalculation' before and it was ALWAYS 'user error' on the part of owners. He then assured me that he would sort it out, and that I should not worry but that it might take a while to get fixed.
The more worrying part is that he did not fix it, and when I called back I needed to spend an hour explaining to another CSR the exact nature of the issue before he accepted that it was obviously an error. He also promised to investigate and get back to me...
I never had any formal response, and I think the points (300 or so if memory serves) almost certainly never re-appeared in my account.
It is an absolutely
glaring omission that marriott do not have any 'statement' in the account and that there is no way (even by calling CS) to get a formal statement of additions and withdrawals from your account for exactly the 'accounting' or 'auditting' purposes you describe.
Anyone with any US Audit or legal expertise here about the right to such records? I have asked CS and been told that "an accounting" of all transactions on my account could not be provided to me even on formal written request.