Can a person file recovery suit for partial amount

Dear sir i had bought a property for rs 1.55 crore on 7 jan 2016. i had to give 1 crore 35 lakhs as rtgs and rest 20 lakhs as cash. just a day before the registry i came to know that the owner has some dispute with his brothers regarding the property. so i gave just 1 crore as rtgs and 20 lakh cash. he had assured me there is no dispute and i can give the rest 35 lakhs rtgs after the mutation is done in my name. in sale deed he had mentioned there is no pending court case and no dispute regarding ownership and possession. IN FEB he filed a suit on me for declaration and permanent injunction. A court case admitted in 2010 came out with his brothers . eventually i had got compromise done in those 2010 cases with his brothers . regarding the suit he had filed on me there was compromise with him and he withdrew the suit on 12 may and he gave statement before the judge that no dispute remains pending with me. he has compromised and he shall never challenge the sale deed . this was done on 12 may 2016. then on 14 may i gave him 20 lakhs rtgs and 15 lakh cash of the pending amount and took full and final payment received affidavit attested by a magistrate . i had given him one security check dated 7 jan 2016 of rs 25 lakhs which was never used by him.. now he has sent me a legal notice on 4 aug 2017 stating that he had lost my cheque and has found it now . so please give me 15 lakhs amount . my queries are as follows. 1 should i answer the legal notice in detailed form with all the proofs or just generally as his legal notice is very vague only talking about cheque and 15 lakhs. but if i give answer in full he gona know my defence if at all he files the recovery suit. 2 - secondly now he is asking in legal notice for just 15 lakhs of the rtgs amount ( total rtgs amount was 1 crore 35 lakhs of the sale deed valued 1.55crores ) . 1 crore rtgs was done at time of registry(7 jan) and pending 35 lakhs rtgs amount was given on 14 may( 20 lakh rtgs and 15 lakhs cash) and full and final payment affidavit taken. can he file a recovery suit for 15 lakhs cash given and then again file a recovery suit claiming i did not get 20 lakhs cash which was the cash amount mentioned in the registry.