If you need any clarification on the demand notice or tax deductions, you can file rectification request in income tax official site.
Income tax help line numbers.
Incometax department of India has provides very good customercare support for varies applications.
http://www.incometaxindia.gov.in/Pages/Tax-helpline.aspx
How to do income tax rectification request
http://blog.tdsman.com/2014/04/steps-filing-rectification-request-receipt-demand-notice-due-mis-match-income-tax/
If you want to look at your 26as form which actually contains all the deductions and tax payment can be downloaded from the link
http://contents.tdscpc.gov.in
http://www.incometaxindiapr.gov.in/incometaxindiacr/faq.jsp?p=faq_eFiling_Form%2026AS.html
Challan status
https://tin.tin.nsdl.com/oltas/index.html
Income tax rectification filing
9:54 AM
Naveen Davis