CRANK runs as an NDIS program of support: coaches, sessions and facility supervision are staffed in advance for every enrolled participant, so the weekly fee is fixed and all-inclusive and there are no single-session cancellations, refunds or credits for missed sessions. The upside runs the same way - attending extra group sessions costs nothing more, and missed sessions can often be made up the following week where practicable.
If attendance consistently doesn't match the package, the right fix is to adjust to a lighter package, switch to remote, or pause (14 days' notice) - all straightforward to do.