deduction of wct-under tnvat

We have deducted wct of 2% for civil construction under tnvat. We are going to pay the  deducted wct to our assessment circle. Now the construction contractor asking us to remit the 2% tax deducted along with form R to their assessment circle. But our AC says the amount has to be deposited to them only.
Which procedure has to be followed.
could experts please guide