[kls]

Did you take the website down or did it just crash? If it just crashed and they are past due on an invoice, then that is their issue and I agree it's not your worry if you are not getting paid. Payment is a huge issue in our industry and a lot of it is due to ignorance or inexperience on the clients part. That does not excuse the issue but it is a real issue. If you are inclined you can try to educate the client or you can look to broaden your client base so that you are not at the whims of political decision making on their part. Either way, if you did not take the site down, and you had an agreement as to the terms of payment and they are not meeting that agreement then you are under no obligation to support them. Doing so just deepens the hole you are in with them. Any client that cannot see this is being unreasonable and you should look to find new reasonable clients.