Completing deleting emails off disk space

[K]

Hello, can anyone please help with my roundcube problem?
I've deleted emails from trash and deleted messages. Both show they have no emails in them. I've also ticked the box in settings for trash to be deleted automatically on logout but something is not working and my disk space is 99%. I'm getting notification emails that the account is at 100% so I'm probably not getting emails anymore. Any ideas anyone?
Thanks!

[JohnDoh]

Please contact your email provider for support.