Prefix hijacking by AS20115

[sethm at rollernet.us (Seth Mattinen)]

I've got a problem where AS20115 continues to announce prefixes after 
BGP neighbors were shutdown. They claim it's a wedged BGP process but 
aren't in any hurry to fix it outside of a maintenance window.

I'm at a loss of what else I can do. They admit the problem but won't 
take action saying it needs to wait for a maintenance window. Am I out 
of line insisting that's an unacceptable response to a problem that 
results in prefix/traffic hijacking?

~Seth