Non-Refund of advance amount given to building contractor due to non-furnishing of Building plan/structural drawings,estimation

Respected Madams/Sirs, (1)We had approached a civil engineer known personally for 02 years who appeared honest and an expert in the field of civil constructions for construction of a house on full contract basis.We did not verify his integrity ,past profiles as we had faith in him. (2)We did have several discussions from June-2024 regarding the plan ,designs and requisites. On demand by the engineer,a token advance amount of Rs 1,10,000/- including Rs 10,000/- for draft sketch/plan.We kept on insisting him to show some of his earlier project which he avoided on one or the other pretext. We did not verify the earlier projects because of faith we personally had in him. (3)There was a time delay by the engineer to provide a sketch/plan acceptable by us. Meanwhile, the soil testing of the construction site was performed by the engineer. Water availability test for drilling borewell was also got done by a geologist for which I paid Rs 10,000/- on [deleted] seperately. (4) Upon frequent insistence by the Engineer, we entered into an agreement on a E-stamp paper on [deleted] with 02 witness and as per the agreement we paid an additional amount of Rs 2,67,100/- but on a condition that the engineer shall start the construction work only after furnishing the final sketch/drawings of the plan, structural details, working drawings and floor plans of all the floors,staircase drawings and designs,3D models of the elevation of the building,Electrical and plumbing drawings etc.. (5) The builder promised to start the construction on [deleted] after one day of drilling of borewell. However ,the builder did not start the work on [deleted] and on enquiry it was said by the builder that the labourers were engaged in an other work elsewhere and would start from [deleted]. The builder failed to start the Excavation(earth work) even on [deleted]. I waited upto [deleted] and when no work started, I conditionally told the contractor to start work immediately . The builder denied to part with the mobile phone no.. of the Construction supervisor(Maistry)with me for reasons better known to him. (6) The Engineer said that he would place the blocks in the construction site on [deleted].When I insisted for furnishing of the final sketch/drawings of the plan, structural details, working drawings and floor plans of all the floors,staircase drawings and designs,3D models of the elevation of the building,Electrical and plumbing drawings etc..and take my approval prior to the start of work, the engineer told that there was no need of that because he himself was the builder & engineer. (7) Ultimately, the builder did not agree to furnish the above documents and hence we mutually agreed to terminate the agreement.Both signed on the agreement document for termination of the contract.I demanded for refund of advance amount paid to him duly deducting if any expenditures.He is denying now. Please guide me and help for the next course of action. Shashikiran [deleted]