In the case of any complaint made under clause (b) or clause (c) of section 36, the Tribunal may--
         (i) fix such rate or charge as it considers reasonable from any date as it may deem proper, not being a date earlier to the date of the filing of the complaint;
         (ii) direct a refund of amount, if any, as being the excess of the rate or charge fixed by the Tribunal under clause (i).