I don't think that anyone "hounding" the agents are going to clear any sort of upgrades. The phone agents do not clear the waitlist, they just tell you what they see. If you "hound" them, they are just going to tell you to call back everyday to check availability. I have even went as far as asking the phone agent to send a message to inventory management or whatever department to clear an upgrade (which never cleared but got an op-up), and she said "ng duk woh". Do they do it for DM members?

Since you are a SL member, you should be calling the MP desk instead of the AM desk.