Medical Billing Dispute: contractor left job incomplete

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Illustrative scenario prepared by my practice.
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Hypothetical question

Using a throwaway bc my boss knows my main. Ok so i'm dealing with a situation and need some guidance.

contractor left job incomplete. I've been dealing with this for about 2 months now and the situation isn't improving.

I have already tried to resolve this directly but got conflicting advice.

What's the typical outcome in situations like this?