I thought the only time that a CONNECTING room (with door between) would be guaranteed is exactly this situation - when there isn't an adult for both rooms. Parties with 2 adults run the risk of getting split with the expectation that 1 adult would be in each room. I'd suggest the OP call back, specify CONNECTING rooms and give the reason, and see what response you get. It is also possible that there are no connecting rooms available for the date(s) of interest - if that is the case ask about whether you arrived a day later or left a day earlier, would that make a difference? Or try one of the other value resorts - maybe another All Star and you can still visit the ASSp food court and pool if that was of specific interest to your kids. Sometimes with very specific requests, you have to show willingness to be a little flexible.
Unfortunately (or fortunately depending on how you look at it) as many of us have found at times, calling back to get a different CM can have a completely different result. So even though it's a pain, don't be afraid to call back a couple times if need be.
Good luck!