Wrongful dishonour of cheque

I was the bearer of a cheque for Rs.25000/- drawn on the Post Office by my aunt of 80 years, who is a pensioner drawing pension from the post office.  When the cheque was tendered across the couter for payment the Postal Staff refused, in writing, payment of the cheque with the reason ‘we have doubt about the transaction’ as the KYC was not updated.  Next day I once again went with all KYC documents enclosed to a letter from the account holder and approached the post office and the Post Master refused to receive the letter and the KYC docs and advised me to encash the cheque from any other post office as still they had doubt about the transaction.  I had recorded the matter in the complaint register.  However, I had encashed the cheque in another post office who had paid it without any objection.  In this connection---

Is there a possibility of a complaint in the consumer forum demanding compensation for deficiency of service, as the money was needed for medical expenses of the 80 year old which was specifically mentioned in the letter?

Is there any ground for moving the court/consumer forum for wrongful dishonor of cheque under NI Act more so when there was enough balance and when the KYC docs were tendered to them?   

If so, can the matter be moved by the bearer or by the account holder?