TDS FORM 24Q

Dear Expert,

I have deducted TDS from Employee's
but as per income slab TDS has been Short Deducted.
We have received notice from CPC.
But Employee's in Income return filling show total salary and pay all tax as a Self Assessment Tax.
case F.Y. 2016-17 and 2017-18

So how to resolve ?

If any clarification please explain step by step.