I work for a general contractor. We hired a new subcontractor. They started the job, then stopped coming, but promised to return. Then they said they would not return and sent a bill. The invoice was dated 2 months after the last day of work and they are threatening to file a lien at the 30-day mark of the invoice. The invoice is way overpriced and doesn't justify the work done. How do I fight this lien and the price gouging that is happening? Thank you for your time.