I am trying to delete my microsoft account but I keep getting the message: "You need to cancel any paid services or Microsoft Points account associated with your Microsoft account."

When I click on the "cancel" link, I go the subscriptions page and it's an "OWL Subscription (current)" however I haven't used this for years and it is free of charge but an unlimited subscription (i.e. appears to expire on the year 9999).

I tried talking to the relevant department on the phone and they are unable to delete this subscription, it isn't charged to any credit card or anything as it was originally from an app on my old phone from back in 2009.

Please help.