Certainly, as a citizen and as an affected party, you have two separate rights to seek that informatin under RTI Act as far as copy of Complaint is concerned as it is a public record. But, I am not aware as to statement recorded as no one can provide such information during the course of investigation, and normally deny information as it may impede the progress of investigation. . Of course, courts strtictly laid down for such justification, as to how that statements can impede the progress of investigation.
\But there is no law that bars an applicant in soliciting any information. So proper course is always file application seeking what ever information is required, without initital doubts and assumptions. Applicants either gets information or information may be denied, and even in case of denial proper justification has to be given by Public Information officer. Even after this there are first appeal opportunity with same designated authority and second appeal option before Information commission , if appellant is not satisfied with response of PIO.
So seek information what ever you require without any doubts at the initital stages and escalate it to first and second appeals.