Very frustrated!!! I purchased tickets to the Zoo ...

Very frustrated!!! I purchased tickets to the Zoo for 9/9/20 for my daughters, grandchildren and me. We had such a wonderful time that I decided to purchase two memberships. What was NOT told to me is how a membership admission differs from a daily paid admission. To sum it up, there is ONE day (actually it was really a few hours) to make a reservation for the following month. Hence, we can not visit the zoo any day in October or November as all the slots are full. General admission is open of course.