(2) Save as provided by the Arbitration Act, 1940 (10 of 1940 ), no contract to refer present or future differences to arbitration shall be specifically enforced; but if any person who has made such a contract (other than an arbitration agreement to which the provisions of the said Act apply) and has refused to perform it, sues in respect of any subject which he has contracted to refer, the existence of such contract shall bar the suit.