Wrong tan at the time of return filling

Total TDS 21,54,119/- 

Industry : Hospital at West Bengal

Current year profit Set off against last 6  years loss.

Also under MAT no Tax liability was arises.

So total Refund = TDS, ie Rs. 21,54,11

During E-Filling some of TAN no wrongly entered.

But total figure of TDS matched with 26AS

now dept willing to refund only 7,12,125 those TAN are matched with Retun & 26 AS and asking for rectification in order to get balance refund.

My question how I rectify the return until unless I have received any intimation u/s 143 from dept  because I have no CPC ref no ?

Now