PUBG Account UC Debt Issue Recovery Problem

I am facing an issue with my PUBG account regarding a UC debt. When I requested a refund, I was informed that there was insufficient UC in my account, resulting in a deduction of 660 UC to balance the difference.
Please handle the refund process carefully to avoid creating any further debt that could affect my ability to play the game. If you have any questions, you can contact customer service for clarification.
Thank you for your attention to this matter.