Return the item back to store

Hi, I’m a new Shipt driver and I accepted a ghost order. I already contacted Shipt Live Chat earlier, and they gave me a $5 adjustment to return the item back to the store. I went to the store, but the employees said they need the receipt number before they can take it back. I’ve been waiting for Shipt Live Chat for about 40 minutes now with no response, and the store is about to close.