How can I complete my home construction work from contractor?

The contractor and me signed agreement of construction between us but builder of the society can't signed in the agreement. He told that time that you have trust me that your construction work of home will be completed within a time period by contractor. He also told that the contractor is my person so don't worried about him. Your home will be ready within a time period with good quality of work. Therefore I signed agreement directly with contractor without any third person signed during July, 2022. that time I ask builder for signed him in an agreement but he told me that don't worry he will completed timely without any complain. Presently, my home construction work mostly completed and there are only few works like wiring work, elevation work and outside color work are remained as per agreement. But now, contractor could not complete this remaining works, and he demand to complete all payment first then after he finished work. So, there is too much time (more than 2 years) taken by him and I paid 28.40 lakhs and only 1.05 lakhs remaining. I ask him that first you should complete my work then I paid all remaining payment. But he doesn't start any remaining work till today. I try to daily call him, his brother as well as builder but they don't received my call. So, what can I do in this matter?