Import materil consumed for own purpose

Good Evening to all!

 i am form tamil nadu we apllicable tnvat. we have  dealing leather business in tamil nadu. we got import & export leather for buying & selling.

But unfortunately we import plywood for our own housing purpose.but we use our tin number for the purpose of import. we could not show the import our monthly return either form I or cst return.

now we recived notice from commercial tax department.to pay tax for the import of material.what is the procedure to solve this problem.