My work hours were refunded and I want to know why

[#1]

My client filed a dispute on my hourly work and I declined the dispute. After my hours are checked by Upwork, they decided to refund my hours. My whole working hours were removed and I didn't get paid.
Since I can't access my work diary, I can't review it. I want to know why my work diary is not qualified.

I know the criteria but I want to know at which point my work diary was not qualified. Please let me know so that I can prepare well for the future conflicts.

[#2]

Hi Hyeonhak,

Thank you for reaching out to us. I’ve escalated your community post to a support ticket. One of our agents will be in touch with you soon to assist.