Notice u/s 143(1) a

I have received notice under section 143(1) a for discrepancies between return filed and Form 16. which is due to investment made under ICICI Prudential Tax Saving MF & LIC premium payment which i made on 30th March and hence the same wasnt included in Form 16.. Now while replying online the website is also asking for TAN of deductor which i am unable to get as TDS wasnt deducted as its an investment and premium payment .iWhat should I do to justify the deduction as i have all the documents but no TAN