Okay looks to me though we are finding a subscription for him in your notify table.
What you can do is a couple things here. For one you can view the users classifieds profile and see if you find subscriptions there.
http://www.nloc.net/classifieds/member.php?uid=XXX
Now if you dont see anything there we will need to go to your sites control panel and use phpmyadmin which is a database viewer in most sites where you can view and work with your databases. You can run a query like so to select all subscriptions based on userid where xxx equals the userid.
SELECT * FROM pp_notify WHERE userid=XXX
Once we see there are subscriptions normally you delete subscriptions from the member profile but you can use a query like this in phpmyadmin again replacing XXX with userid of the user.
DELETE FROM pp_notify WHERE userid=XXX