Hi Peter, thanks for reaching out! Deleting rows after you've stopped updating them does not cause a credit refund. If the enrichments have already been queued, they have already called an API request to the data provider and thus will continue running. All future requests will stop when you select "stop updates." Happy to make a one-time exception here and add credits back for you but in the future, please turn off auto-update in your table/column so you are not running enrichments that you don't need.
Here's a guide on how to conserve credits in Clay: https://www.clay.com/university/lesson/clay-credit-conservation
Let me know if you have any other questions! 😊