Tds default

Dear sir

Resentle My company is resived one mail form Income tax department. it is the tds default of the interest. Filling the challan no 281, it is filling the 20 company or 21 other than company???????,   and filling the sec code??????????? , and the the notice is 400???????.................................... filling the challana all coloums .

Please clarified the aboue Doutes

Thanking you

G.O.REDDY