Losing Google Apps primary domain

Losing Google Apps primary domain

A long time ago I got a free Google Apps account using a DynDNS domain.
Since then I've added multiple top-level domains.
DynDNS has changed a lot since I started using them 4-5 years ago, and
they require you to log into your account frequently even if you have auto
updaters on your domains. I missed their email and they deleted all my
hosts so I now no longer have control over the primary Google Apps domain.
Is there anything I can do? Basically there is no way I can keep my free
Google Apps account unless I run the risk of not having the primary domain
anymore?