A) Didn't your confirmation e-mail say, "In lieu of a one-month extension, you have selected to cancel your annual pass and receive a partial refund for the remaining access days of your annual pass from July 11, 2020 through your pass expiration date (as extended, if applicable)"?
I was under the impression that the refund goes from July 11 to the extended expiration date, which is your original expiration date plus 117 days. The extra one month extension past that date is for people who choose not to cancel. That's what I was told by a CM on the phone. I wonder if your CM was misinformed.
Originally Disney indicated that the extra one month would not appear on the APs until October, but they later ignored that and their computer system started adding the extra one month to APs on approximately on July 15.
My assumption is that when the APs are cancelled, it won't matter if they were showing that extra one month. Cancelled is cancelled.
B) Didn't your confirmation email say, "Your pass will remain valid through August 11, 2020 and will be cancelled effective August 12, 2020." Disney is letting people continue to use the APs for awhile even if the passholder chose to cancel. Maybe Disney thinks they will make money by letting passholders spend in the park restaurants and gift shops for awhile. Or maybe they assume their system couldn't handle the task of processing all of the cancellations as of an earlier date. Or maybe they think it will earn them some good will from the passholders. Who knows.