Hi Akaphon,
Please contact with Mr Galon about this directly, his email is: info@topfun-inflatable.com
Sorry for my later reply due to my vacation, i was back office yesterday.
This product is not quality problem, it was communication questions, so we pay 305usd, and you pay 665usd is fairly.
If our products have quality problem, we would take full responsibily, make a new one for free.