You did well so far. And yet, I'd request you NOT TO confound the entire system with a crooked official ... RTI is NOT an eyewash ... RTI IS one of the most powerful tool in the hands of a common man today (second only to a 226, in my humble opinion).
Like I said, you have done well so far; stay on that track. It may sound tough, but don't feel frustrated and attend the next hearing. You seem to be aware of the basics as a prudent person, continue applying that prudence; blank assertions as to ordinary post dispatch or unoffical communication be damned...let the crooked cops/administrators try their stupid excuses. Just attend the hearing; wait and watch what the State Information Commissioner comes up with. In the meanwhile, before the next State IC hearing, make a Complaint to the Central Information Commission with a copy marked to State Information Commission [DO NOT make a composite communction to CIC seeking information as well as penal action; that'd be rejected; only explain the facts of how you are being denied information on frivolous reasons and VERY PERTINENT, DO NOT make any wild assertions; just the facts that you can prove from records in future]! CIC will NOT do anything on such a Complaint but how it'd help is, in the long run, in getting your word on record BEFORE the next State IC hearing, nobody can blame you of afterhtought.
Keep in touch after the next date of hearing and my gut feeling is, most probably you'll get some good results; if not in next hearing, then from CIC...always nice to have dumb opposition like you seem to have!