TDS Refund

I have file my income tax return For A.y. 16-17....i claim refund of TDS amounting to Rs. 5000 bt out of that 2000 were not reflected in my 26AS so ITO only give me Rs. 3000....bt In current A.Y 19-20 the party deposited in my PAN and its get reflected in 26AS....Now how to claim that 2000????