Subscriptions with #unknown channel

On our discord server we were going through changing some channels and now we have unused subscriptions that are linked to #unknown channels.
When we perform the /subscription remove command and put in an associated ID, we get an error because its not part of that specific channel.
Is there another way to force removal of subscriptions?

Please provide the Subscription ID's and I will prune them.
If you are wary about providing them in a public space, Send me an evemail in eve online with the subscription ID's. Thank you.

The four subscriptions provided in the evemail and their duplicates have been cleared.
The bot is suppose to notice nonexistent channels and prune subscriptions automatically, The code will be reviewed as soon as possible.
Thank you for bringing this to our attention. Appreciates!

You can also now manage your discord subscriptions on this website in your dashboard.