IDFC Bank — IDFC Fastag - Weird Dispute process

I regularly travel on Hyderabad ORR.
For some reason, I was charged way too high for 1 day travel on 22nd Dec.

From Rajendranagar to Nanakramguda, the toll is Rs 30, but I was charged Rs 80, TXN #[protected].
And on the way back, it should be Rs 15 as it was return journey on the same day, but I was charged Rs 70, TXN #[protected].

I raised disputes on IDFC First Forward portal, by selecting particular transactions, and categorizing the complaint properly as Excess charge and Partial amount refund.
But both the disputes were rejected.
Calling their customer care, I was informed that Trxn number was not mentioned in description, hence 1 dispute was rejected. and for the other they asked me to upload back side copy of RC. She asked me to raise dispute again and write email with RC, vehicle picture etc...

This is absurd, because without selecting a particular Transaction, I cannot create a dispute. So TRxn details should be there already with dispute process team.
And without RC copy, dispute cannot be created.