Update: Despite continuous follow ups, the dealer is not responding at all. Seems he did this on purpose. Phonepe (the acquiring bank) atleast responded and refunded me with only the fuel surcharge after more than a month long fight. But that does not at all compensate the impact I had in terms of milestone benefits and the RPs of diners black and the extra charge I paid to the dealer. So I requested the bank to file the chargeback. The bank however is asking me whether you want to file charge back for the entire amount or just the extra charges?
Can you please suggest what should I tell the bank. Also the any other place I can take this issue to before filing a chargeback?