Please correct yourself. You are not correct in saying "but i think there only bribe is the medium " .
You can file an explanation even if you have received notice after the expiry of the fixed date. You can state the facts that -
(i) the notice was received by you after the expiry of the fixed date.
(ii) the fact of not having the knowledge of the demand raised by the department as no intimation u/s 143(1) was served on you till date.
By bringing the above two facts to the notice of the assessing officer you please state in the explanation that the failure to clear the demand is due to the above facts and niether wilfull nor negligence on your part.
If you act as above you will be in the good books of the department.