I canceled a weekly repeated walk, but meant to edit before canceling. Now my client wants to switch the days! What do i do??

My client scheduled two walks this week on top of a weekly repeated walks schedule, so they were charged twice. I canceled the weekly repeated walk schedule as they requested. But this weeks walks are still being charged to them from the weekly repeated schedule. The problem is they want me to walk on different days than what the weekly repeated schedule says. My thought was to cancel the new walk requests this week and edit this weeks repeated walks, but I don't have the option to edit the canceled weekly repeated walks this week anymore. Help this Newbie out!!