No legal agreement available for construction

Last year in 2020, we came into contact with this Architect with whom we finalized the deal in 27 lacs for the construction of my house but due to covid time, all offices were closed so we could not make any legal agreement of the same. Subsequently, he has given us the agreement in the PDF form in which material to be used and stage-wise payment details were mentioned. The work started and after one month we came to know that the work was running on the wrong plot and the plot belonging to us was the adjourning plot. By that time, he has finished the work till beam and column and we paid him 9.40 lacs. The work again started in the correct plot and he was to suppose to handover the house to us by March or April, 2021 but he keep delaying the same giving vague reasons. Then again he said he will the finish the work by the end of June but instead he called me and said if I give more 8 lacs den only he will continue the further work otherwise leave it as it is. With the amount of Rs.26 Lacs, he has made only structure of the house and not ready to give any estimate of Rs.26 Lacs or any receipt of the materials. Now my question is as we do not have any legal agreement, is there possible to go with the legal proceedings or police complaint? Thankyou. Regards, Swati