Thanks for the clarification!

I'd send the assistant an urgent fax and give her a few days to respond. Then, I'd send a copy of the fax CMRRR (green postcard) addressed to your attorney, not just the law office. If you decide to try and hire a new attorney, documentation that they've neglected your case might help get their fee reduced or forfeited--but I doubt it'll be necessary. The fees are so low, they tend to overextend their staff and those who gripe the loudest get the most attention.