...voucher/receipt by one of the parties and also a discharge by “accord and satisfaction”, proceeded to observe:“29. It is thus clear that the arbitration agreement contained in a contract cannot be invoked to seek reference of any dispute to arbitration, in the following circumstances, when the contract is discharged on account of performance, or...discharge of the contract by performance is acknowledged by a full and final discharge voucher/receipt, nothing survives in regard to such discharged contract;(b) Where the parties to the...contract, by mutual agreement, accept performance of altered, modified and substituted obligations and confirm in writing the discharge of contract by performance of the altered, modified or substituted...