Send the seller a message to send you a cancellation request this will stop your payment reminders.
Remind them too, doing this and selecting ' Buyer Requests to Cancel' this will refund their seller fee which was charrged the secod the item sold, this might spur them to send that cancellation.
I do appreciate you have not initiated this cancellation, but a reminder of a reversal of fees selecting this option might give them the incentive to move on this.
