At the end of the day, if you insist on controlling all of the reservations then you risk the issues that happened in this case.

If you cannot trust others to do what they should do, you cannot blame Marriott for flagging the account when something that should not have happened does happen.

You got a very fast resolution... you lost no access to make reservations or "manage" your accounts, you just had to call in to do it.

Marriott is dealing with more than just one customer... and they do not work 24/7 in all departments.

At the end of the day, you received a prompt resolution to your issues... much quicker than the average customer would have... and, as we now see, it was a coworker that caused this issue initially... not Marriott.