This is a commen Mistake done by CPC.
and different amt. of interest u/s 234A/234B/234C is also because of non credit of TDS
First View Your Form 26AS (Tax Credit) whether it shows the full TDS Credit or not and if it does not show full credit then contact your concerned Employer. most propably their would be some mistake in their TDS Return.
Secondly File a rectification request u/s 154.
You can View Form 26AS and file a Rectification reqest online through