143(1) intimation

Pls some one clarify this..

I have received intimation u/s143(1) for demand related to ay 13-14. Actually in that fy 12-13 i had received arrear of salary and at the time of filing the return i had not claimed relief u/s 89. I had received notice in sept 2014 and respond to that i filed 10e form in september 2015. Now i cant revise the return of that year. Department is saying it is timebarred u have to pay demand. 

Pls share the way for not paying the demand is there any option its urgent...