It seems absolutely ridiculous to me that there is no easy method of permanently deleting an account (or even requesting it).
The process is unnecessarily opaque, requiring submitting a ticket (though you have to deactivate your account first which leaves me no way of monitoring the progress of said ticket) after deleting all my notes. I know enough to know that this must be a deliberate design decision and there are plenty of other frustrated people out there also finding this unacceptable.
I'd be inclined to phone/write/email etc. if there were any contact details available - most on t