Legal opinion

Construct home I put agreement on April 2019 6 to 8 months tenure1900000 +1lakh for sump and septic tank and outer steps.for month contract slowly construction going on after finishing roof level I give 4lakh amount he will abscound I will complain civil engineer association for my amount He valued 1120000 out of 1240000 after that my engineer is not an association member and not an engineer only diploma engineer not finished association said not control the engineer bcoz of non member our dispute amount120000 he advised complete work with that engineer after work amount 900000 he valued and we both r signed and now 1120000+900000= 202000 I pay 1457500+250000(cement + wood items)= 1707000 balance work of 300000 not done and now he discontinue work in February I will try to call not answer I will go to engineer office and office is not there he shifted after that I will continue work with my electrician and plumber after 3 months he will now go to the police station on 19may complaint about me for not paying amount of 500000 I am taking bills and go not any response in police station waiting for 5hrs come tomorrow informed me next day morning call from AC office come one 9'o clock I will go and explain everything and bills in AC office they ask letter of we are futher move in court we will give and come on next two days engineer come to construction site with 15 mebers and start fighting with me ask money I call police and complaint in police station they tell take valuation and finish the problem but he is not come to the valuation and I talk to compromise the situation but he ask 300000 otherwise I will go to court not allow the construction work now what can I do pls give suggestions