For users looking to transfer their subscriptions from one hub to another, please check out this post:
For all things related to subscription, you can create a case by visiting the following page:
With that being said, the answer to your question, is that you need our help to transfer the service from one hub to another. I recommend canceling the C7 service then moving the bundle from C5 to C7. If you send me a private message along with your email address, I'd be glad to further assist.