CPA/Accountant Liability — contractor left job incomplete

I'm dealing with a situation and need some guidance.

contractor left job incomplete. I've been dealing with this for about 11 weeks now and the situation isn't improving.

I have already done some research online but the other party is not cooperating.

What are the risks if I pursue this? What's the likely timeline?

Been there. Here's what I learned.

The biggest mistake people make in this situation is escalating to a supervisor/manager. I'd recommend following the formal complaint procedure instead.