Country club membership cancellation

Country club Calicut invited me and my wife for a meeting offering free holidays on 26/10/2018. They offered many things to enter into immediate contract for a spot offer of 255000. They collected two post dated cheques each of 12750 for and we signed on the contract note. in detailed analysis it is revealed that many offers are misleading. When I contracted the club they refuse to cancel the deal. How can I close the contract well before realizing the cheque.