Retcification u/s 143(1)

last year i have filed 2011-12 financial year for refund amount 16777 which are deducted lic rs 16400 and shriram chits 377 but some days back i recieved intimation u/s143(1) in that while processing they have concidered only 377 rupee but in 26as both amounts are appeared then his net income also 1lack 54 thousand some thing so what option are available.

or

shall we make rectification return ? if yes how to make

or any other option