Self-hosted Subscriptions

Hi, I’ve got an old subscription for gitlab ee which we wanted to add some more seats for.
I realise the old plans have now been replaced and when trying to renew the subscription, the site wants to adjust the subscription to the Starter plan.

The subscription site doesn’t really give many options and I’ve had no luck emailing sales@gitlab.com. Are our only options here to be forced to be downgraded to Starter from Enterprise?

Thanks
Alex