Vistara — Fare mismatch with Credit card receipt

Address:

T3 Terminal Delhi Airport ticketing counter

I had bought the tickets from the Vistara counter at T3 on 26th of Jan '23.
The fare charged was INR 7935 (Credit Card Slip) and the receipt I received was for INR 7585. (attached)

There is a difference of INR 350 which I am unable to match with the CC Charges.

As of now, my client has refused to make the entire payment due to this discrepancy. It is affecting my business but Vistara doesn't care.

Have tried calling the customer care number on the ticket received but it keeps getting disconnected after listening to their hold music. Their number given by Delhi Airport CC is switched off.