When you change the products or collections in your store, the URLs used in your ads may stop working. This is the main reason why Google will disapprove your ads. Your campaigns need to be updated to fix the issue. Contact support@cleverecommerce.com if you need help with your disapproved ads. Please notice that remaking and updating your Clever campaigns is a Premium feature. You can also fix the ads by following Google's instructions on how to fix a disapproved ad.

More about Campaigns update

I want to be Premium