Well, you can look through the Hotel Status Match Master Thread . But in all you will get about the same info as in this very thread. Marriott just doesn't match very easily.

With that said, you (1) Keep calling until you find an MR help desk person willing to help you out, (2) Ask the MR help desk person about a possible elite challenge rather than a status match. I have seen a number of posts recently where Marriott may be allowing those more than a status match. You might have more luck with both of these options if you can show the Marriott rep that you currently have 'X' reservations on file. This shows that you really will be moving business their way and they may be more willing to work with you.