Hi Noah, here's what I found out.
UCR Rec Ctr (rentals) is on the regular shop program. Sounds like someone at the ticket dept may have confused it with the VIP shop, which is free early season on weekends. The reg shop program, early season, is $25 weekends and free M - F.
With regards to your pass, are you talking about a personal season pass? Yes, they can be renewed here https://shop.mthigh.com/p-49-1213-adult-season-pass-renewal.aspx
For all other questions, please fee free to contact Sean Hersey at 760 221 2124.