I created two topics and then later subscriptions associated with them. After few days I deleted the topics but since subscription were pending, I was not able to delete them
After few weeks I saw the subscriptions are still in "Confirmation Pending" state and in some amazon-aws forum I read, pending subscription requests are automatically deleted after 3 days if not confirmed. So now I manually tried to delete those pending requests and I am getting this error
Error code: NotFound - Error message: Topic does not exist
Same here. A SNS subscription was hanging around for more than 72 hours/3 days and had to raise a ticket with AWS to delete it manually from the backend. Looks like there is no other solution than to raise a ticket with AWS.