제가 문의한 내용
I found bug but I did not find support ticket. so I didn't report.
my account is upgraded premium to business.
and I paid 3 month.
but I got extended 6 years.
There is no a bug ;) Don't worry we offer additional extra time for our loyal clients ;)
즉 해석해보자면 오래된 고객에게는 추가 연장을 해주고있으니 걱정하지 말고 연장된 기간대로 쓰라는거네요.