The most common reason for not being able to delete a Page is because the user is not an admin of the Page. If you are an admin and you still can’t delete your Page, it’s possible that there may be another admin who may have canceled the Page deletion before the 14 days passed
How to delete a business page on Facebook
How to Shutdown and Delete Facebook Business
Remove your page by going to the Settings menu of your website. Select the “Remove Page” option from the bottom of the list, then click “Edit” next to “Delete your page.” Select “Permanently delete [Your Page Name]” and confirm your choice. To delete a page, go to its Settings menu.
Delete a Facebook business page on iOS or Android. From the Facebook app, go to your list of pages and choose the one you wish to remove. Go to options and select settings after editing your page. Look for the ‘Remove page’ option towards the bottom of the screen and tap it to permanently delete the page.
“If you permanently delete it, all assets (ad accounts, Pages, and product catalogs) will be deleted from your company. You’ll retain admin rights over all assets linked to this business through your Facebook account.”
Open Business Settings to delete your Business Manager. Open the Business Info screen by clicking Business Info. Select Permanently Delete, then follow the on-screen directions.
You may not be able to delete Business Manager because of the following reasons: Ad accounts: Make sure you don’t have any outstanding ad account bills. If you owe money, keep in mind that it might take up to two weeks to settle your account. All ad accounts must also comply with our Advertising Policy.