notice u/s 143(2), 142(1) and 143(3)

I just want to ask that I have filed 15 ITR's of 15 different persons in AY 2014-15 in itr 4 instead of Itr 4s in sept 2015 the all the person's received notices u/s 143(2) and now ITO sending the notices u/s 142(1) for assessment along with questioner of 5 pages. I think it's bacame very big problem. Actually some of the person didn't have bank accounts in that so I m not how should the department took their cases in secrutiny and now what should I do. because I do not have record of any person for that year aspect bank statement.