In the first instance, wait for 10-15 minutes for the order if they are still preparing it. You can always inquire about the estimated time remaining for the order to be ready.
If it takes longer than expected, talk to a staff member explaining that you are there to pick up the package and mention how long you've been waiting.
If the package is not ready, and the store is not actively working on packing the order, immediately contact the Sparqle support team. We can then reach out to the store and inform you about the next steps.