Duty Free Shop — I am not given my receipt and been over charged

Address:

Chennai, international arrival

Drear Team,

I am writing to inform that I have been over charged and not given the receipt after the payment.

As I was having a connecting flight, I had to leave the place.

Place: Duty free shop (Chennai Airport international arrival)
Product :
1. Glenmorangie (14 years)
2. Glenfiddich (VAT 04 18 years)

My phone number and passport have been registered.

I would appreciate if I can get the receipt of the payment.

Regards,
Anindita kar