seating allocation not granted

I booked and paid for a aisle seat due to an leg injury, and when i got on the flight I was stuck in the middle seat for a 10 hour flight from Hawaii to Sydney, even though they had aisle seats available. I put in a complaint and this is what i got told.

Thank you for contacting Jetstar.

I have reviewed your case and requested a refund of AUD $9.00 be processed back to your credit card. This is to cover your seat fee. You should receive it within 8 business days.

I’m sorry to hear you were disappointed in your seat on your recent flight. Whilst we try to ensure all customers are seated in their preferred seats, this isn’t always possible to do so due to weighting of the aircraft, emergency exit considerations and the important of seating children with their parents and sometimes we do have to make changes on the day you travel.

I sincerely apologise for any inconvenience this meant for you. we look forward to welcoming you and xxxx on board when you do.

I was not happy with the response so emailed back to be offered a voucher. What a insult! they know I won't be using Jetstar again so how will i benefit with a voucher?? I told them how I felt and asked if they could have offered it as a refund not a voucher they said they were doing it in good will and could only provide the voucher. Good will to who????

So why should we pay for seats when they can just put us where they like????? They stuffed up and won't own up to it.
Thanks Jetstar

International
Australia-Sydney
Australia-Sydney