17. Prohibition on terminating or giving up contract: Except where act has been done in contravention of any terms of the lease bond or any act required to be done pursuant with such terms has not been done or the contract has been terminated pursuant to Section 12A., after a lease bond has already been executed pursuant to this Act, no contract may be terminated or given up in the meantime prior to the expiration of the ter of contract without consent of both the Government of Nepal and the contractor