XYZ & Co. had filed returns of AY 2008- 09 within the due date claiming a refund of 1 Lakh rupees. The intimation u/s 143(1) has not been received yet. After few requests for refund, an amount of 50,000 has been approved by the income tax department in Dec 2015. Can the firm claim refund again for the balance amount? Is there any time limit for claiming it?