Plot agreement not signed but cheque misused by seller.

Seller deny befor agreement signing but Cheque misused bounced.. This is a case of Property dealing, where seller demand for 1 lac cash & 3 lac cheque at time of the plot bayana. for this i purchased 100 rs stamp paper bayana agreeement prepared by steno where cheque No. also mentioned. next day we were in tehsil to noterized the same, i gave him rs. 3lac cheque & 1lac cash , case got disputed over rates so pepers tear/thron in dustbin as seller said prepare new agreement next day with revised rate , Next day he deny to sell property and promised to return back cheque, for safer side i had not deposited 3lac amount in bank and also check stopped in bank. now after 3 day he deposited the cheque, bounced and now send me a notice said the i borrowed 3 lac in 2 part from him in last 2 yrs, now cheque paid in settlement & bounced. (((what i have ))) 1 non signed agreement photocopy, 2. Cheque signed by me but written by other with not on back side ( Advance payment for plot bayana )