Hockley ferret rescue

Hi guys, I'm Hockley ferret rescue , we have faced an extremely difficult year with many surgeries needed, so many poorly ferrets have arrived, in the last few months we have had 5 with tumours, that have needed surgery & 17 recent neuters as well as the sickies needing antibiotics, we are at a point where my vets have had to say they will no longer treat any rescue ferrets until my outstanding bill is paid, so what can I do? I need to appeal to you guys who follow & support the rescue for help to continue to rescue & take in any fuzzies, without my vets support I cannot treat any that come in poorly