We are seeing duplicate customer in the customer file. I suspect that there is a sync issue between the customer file, rewards, & text/email receipts. We can manually add a customer on the back end, but when they sign up for rewards it creates a new customer record. On transactions where we have a validated customer, if we select to email/text them a receipt it prompts us to re-enter phone number/email address which creates yet another duplicated customer record. How do we keep our customer file 'uncluttered' with duplicates?