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If you need to check with customer service about your Roku service (as opposed to the Roku 4 box itself), then you need to check with them.
By the sound of it, the service itself is down, not the internet data connection, nor necessarily the Roku 4 box itself.
In which case, you need to find out from Roku themselves, what the status of your Roku account is.
Here's where to get contact information, or a live chat session... and they are 'open' on Sunday: