Unresolved trade dispute?

Hi there! I have a trade dispute that I opened back on 13 April (Dispute #1459), with the notice that the other participant has until 20 April to respond. We're now well past that and I've pinged the support staff twice with messages within that ticket, but have seen no response. So, trying here on the off-chance this will get it some more notice.

Is there a significant backlog of disputes that are being processed? Or did this one fall through the cracks to get followed-up on?