Added a 20kg luggage and paid the luggage fee of 40 EURO, on the day of the flight we arrived at Yangon International Airport for our flight and found out during check-in that the Nok Air system did not reflect the luggage allowance of 20kg that had been paid for. I called call centre about this and was told that the payment had been successfully made but that the information did not go through to the airline’s system so I need to pay the extra fee at the airport again and ask for a reimbursement later. Therefore I had no choice but to pay the extra fee again at the airport for the extra luggage allowance. Had to go through all this process in the airport and still did not get return of the reimbursement of extra luggage