Under RTI an application has to be transfered to the concerned office where the actual information is available in case it is not available with the concerned PIO. And he need to inform the address of the concerned PIO as well.
Please post the question which you asked and the reply you got.
Regarding the appellate authority CIC has issued instruction that the PIO has to include the appelate authority name and address in the reply. If PIO has not included it can be taken as incomplete reply
These two can be additional ground to take up in appeal. I will find the circular and enclose later.