You have raised multiple doubts, which needs to be clarified 1st. (1) You have already executed a Sale Deed for the said property and hence you have no right on it., but subject to the following conditions. (a) You should say whether the PDC were mentioned in the said Sale Deed or Not. (2) If mentioned, whether a clause stating that " the said cheques have received subject to its honour" or not. (3) If you have taken any steps, after return of the said cheques or not.
It is the only remedy to file a suit for recovery of the sale consideration amount.Your case needs personal verification of documents. Otherwise, it is not so easy to give reply. The doubts should be clarified in detail.