What is the current status of your application? The best way to contact an Embassy or Condulate is via Messenger if they have a Facebook page, try that detailing all the relevant information (name, passport number, application reference etc.).
An extension based on marriage does not need a 12 moonth history of funds, just 3 months to show the 400k has seasoned for 2 months prior to the application
If your husband gets new insurance and does a border bounce before the Non-OA expires (the visa not his entry stamp) he will get a new 12 month stamp but will require a re-entry permit to re-enter after the visa expires