I understand but surely the notification isn't there all the time, only on starting Sonar.
I honestly think that over time we will see a maturing of the whole account management, activation, download etc system. I'm not a Cakewlak apologist but in the short few months we've already seen Cakewlak acknowledge issues with some of these processes and they have tried to fix things.
I'd put in a feature request
As far as changing card details, are you doing that at the Cleverbridge site?
When you get your acknowledgement of payment, that email has a link that will take you to your Cleverbridge account where that should be possible. Maybe, I hadn't tried to do it when I was on monthly, I'm now on annual.