Airline not committing to a voucher they offered

<p>I had a bad experience of serious flight delays and the airline offered me a card voucher for inconvenience caused. After a few months I have followed instructions of the card to redeem the voucher howeve they now tell me they require the exact flight number and details. </p> <p>I have been making almost 3 trips per month and I cannot remember the exact flight number. Why did they offer a card which holds no value? Why didn't the person giving out the cards to the dissatisfied clients explain how it works? Now they are trying to use this as an excuse to keep to their commitment.</p> <p> </p> <p>I have used the airline to travel at least twice a month last year. Dont undetstand their pethetic service to loyal customers.</p> <p> </p> <p>Kulula should not hand our **** voucher cards.</p> <p>Their customer relations team says they cannot assist.</p> <p>I need urgent response and commitment from them</p>