Change reason a purchase was canceled

[m543a2]

Since ebay is not interested in speaking on the phone, i hope i can get a swift reply / resolution here.

One of my employees erroneously canceled an order before the buyer had a chance to pay.  He marked the reason for the cancellation as the buyer not paying.

Now my buyer is quite understandably angry and i have no way of undoing the cancelation or changing the reason and no way to have a conversation with anyone about what do now.

So, what to do now?