A lawyer used AI to write a report, but billed full time. What should I do?

A client says a lawyer delivered a poor-quality report with a fabricated reference typical of AI hallucination and billed a surprising number of hours, and that a first-level judge rejected the evidence presented. The client says Pangram later flagged about a third of the report as AI-generated, including the hallucinated reference, but the client does not plan to appeal due to cost and risk. The post asks what others would do in this situation.