Intimation received under section 154

Fact-

In intimation received u/s 143(1) CPC did not considered TDS amount, whereas TDS is reflecting in 26AS properly. Therefore we have filed online rectification. After 10 to 15 days of filing rectification, we received intimation u/s 154. In intimation u/s 154 CPC also did not consider TDS. They also not mentioned any reason for non-consideration of TDS in intimation.

Question-

1. How I can know the reason of non-consideration of TDS by CPC?

2. Now which option is available with us - whether to pay tax or  any appeal/Rectification/ Revision can be filled?