Have you contacted Marriott Customer Care? In my experience, they have been very good about following up with hotels on issues.

I stayed at a Marriott hotel overseas a couple of months ago, the in-room HSIA did not work in spite my corp rate included the fee. The hotel offered me to use HSIA in their Business Center, but it was a bit inconvenient as I had to carry my laptop around (it was located on the opposite side of the building).

After I came back home, I sent a quick note to the customer care (just as my feedback - I was not complaining anything, actually I received very nice upgrade and the overall stay was cool).

2 days later, I got a call and an e-mail from the GM apologizing the inconvenience I experienced. She even offered me a free night in my future stay at the hotel... :-: