Indian Railway Catering & Tourism Corporation [IRCTC] — tdr rejected

I had booked 4 AC compartment ticket of Koyna express for 3 September. However I got SMS from IRCTC on registered mobile number that we have been allocated seats in lower class. As we wanted to travel only in AC I had submitted TDR to get refund as we were not planning to travel by Koyana express. We managed our own travel by road.

After few days I found that my TDR status is TDR repudiated. However I have submitted the TDR for correct reason and within timelines.

I need to know the reason that TDR got repudiated.

Cancellation id- [protected]
PNR- [protected]

Thanks- Jyoti