There is definitely something wrong if the transplant team was going to move forward, knowing a donor loses 25% - 50% of their capacity. Frankly, your current GFR level puts you in the "mildly to moderately decreased" level to begin with.
Did you have an independent donor advocate (IDA) assigned to you? Ideally, the transplant team would have assigned an IDA to help you through the process and represent your interests.
Does the hospital have an ombudsman? This is someone at the hospital who helps to solve problems on behalf of patients.
Another possibility is to contact UNOS's patient services. While technically you're not a "patient," UNOS should be made aware of this transplant center's policies. Unfortunately, while UNOS publishes guidelines for such things, each transplant center can do whatever it wants and UNOS has no enforcement power. (888) 894-6361,
patientservices@unos.org