Well, I'm not one to actually ever give up, lol.....but what I have done is decide that if no other discount comes along, I'm fine....it's in the budget and I'll spend it. That does NOT however mean that I won't welcome a discount with open arms.
So...I'll keep calling every few days....I'm also calling about changing a few late night ADRs so far without success either........and if there is something great, if not, I'll remember that I'm find, I have a room I can live with and in less than 3 months I'll be sitting in that room, lol. As for the ADRs, I figure if I can't get it changed than I'll just have to go back to said room and take a nap before dinner, lol.....because otherwise I'm not sure I can stay awake to eat at 9pm.
So....if you can keep checking without it stressing you out, then do it. If getting a no answer is going to be stressful, then I'd suggest just accepting the price you have and finding something else to obsess over.