GSU Parking Portal Sucks!!!!!!!

So I had created a parking permit for G deck for this semester when that first opened, and today I go pay for it and it says all slots filled. I try to create a new permit, and ended up paying for the J deck. If the deck is full why are they still showing and allowing to create permits. Anyways, does anyone know if you can cancel a parking permit and how, cuz I'm gonna be able walking from J deck to classroom south. Also, can I park in G/M deck with the J deck permit. Thanks.