Blizzard is not likely to respond here. And they will definitely not be issuing a refund from this forum report. You need to contact customer service, but they aren’t very good and will probably send you back here
Edit: I see you asked for a reinstatement of your run, not a refund, so I apologize for misreading, but you’d still need to reach out to customer service, and I can tell you that you are not likely to reach anyone who can help you
This is a known issue. You disconnected, which is why you lost, 20 minutes before you tried to close and reopen the game. Try to act more quickly next time so that you can return to the game before it is over