From what I've seen here Roku is not the least bit helpful if your account doesn't show any subscriptions. One thing to double check is that the email address that shows up on your Roku device under Settings->System->About matches the email address you're using to check you subscriptions at https://my.roku.com . More than one person has unwittingly created multiple Roku accounts.
What I don't understand is when you say, "Now I cannot access other ROKU channels.". That doesn't make any sense. You don't need any payment information on file to use a Roku unless you have subscriptions paid through Roku (unless you're trying free trials). I feel like you're leaving out some information.
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