In this case, you should be getting all major Spotify notifications directly to your registered email address (updated account info, change of payment details, notifications regarding your subscription). If you're not sure of the email currently registered on your account, just head here
You can also opt-in for additional Spotify notifications from this link. We hope this helps. Have an amazing day 🙂
Maybe I wasn't clear enough on my first post, sorry about that. I know that I am a registered member (and have been for a long time); What I would like to know is what was the date I registered and also what was the exact date of my first Premium payment.