Indigo Airlines — luggage damaged

I travelled from hyd to mumbai on 4th aug via indigo airline, on arrival while collecting my bag from baggage counter at mumbai airport i found handle of my bag is broken due to improper handling by indigo ground staff..
I reported it immediately at indigo baggage counter and they took photo of damaged bag and confirmed that its totally damaged during transfer and they will raise it internally to their resp department but they simply refused further action saying its not coming under any compensation rule..
They will just highlight itand apart from that they can not do anything..

I need your help as i would not bare this cost because of careless staff of any such airlines..