[Updated] Issue resolved.

I have paid one invoice with bitcoin and so far it got 22 confirmations and marked as Paid in Bit-pay.

But in Billing - Invoice page, it's still shown as Unpaid.

I have opened a support ticket but haven't got any reply yet so I make a thread here in case anyone can reach support staff. I'm afraid my VPS will get automatically terminated soon if it isn't taken care of.