Section 139 of income tax act

I am in 20% tax bracket and all my taxable incomes were correctly declared and TDS was made by employer. For my blood cancer treatment, insurance amount reimbursed by Insurance Company (Rs.50000) is sometimes temporarily parked with Bank for 30 days' FD before next admission to Hospital. Bank have correctly deducted 10% TDS but Dept now issues Notice u/s.139 of Income Tax Act. Please guide me how to handle this situation.Thanks & Regards,