Received notice u/s 143(1)a what to do?

Dear All,

I have received notice u/s 143(1)a against my itr filing for AY 2018-19. lets say in my ITR i have claimed loss of Rs.100, the received notice says that as per department computation loss is Rs.99/- difference of Rs.1/-.

I have replied that notice and made adjustment in short & excess and filed the revised itr in response to the notice. Now once again i have received the notice stating that loss as per department computation is Rs.98/- as against Rs.99/- which was earlier calculated by the department. 

Kindly suggest how to proceed further.

Thanks