I'm sorry that the CM was rude, but her information may have been technically correct.
Disney
doesn't necessarily offer discounts to the public. The have PINS and promotions. If you don't have a PIN addressed specifically to you and there is no promotion running during your dates....Disney doesn't offer discounts.
PIN codes are not publically released and there has been hit and miss info that CMs have been told they cannot check for them but you must recieve them by mail/email.
Does that mean all CMs will answer you as the one you reached did? Nope. Try calling again and see if another CM will check for you.
But, keep in mind that Disney
is not obligated to offer discounts to anyone. Not even annual passholders who frequently buy APs for the discount benefit. Disney can choose at any time to not offer discounts, to black out dates, to end promotions, to offer very limited availability of promotions.
If other resorts are "throwing discounts at you" them perhaps you should take advantage of them
That being said, there are promotions running on the WDW website, one until mid-June and the other until mid-August. Disney won't offer fall discounts until they feel they have reason to do so (lower bookings than usual etc.).