The correct answer is; Offer the customer some literature about the product to take with them.
Further Explanation:
If the customer is already using a product that your bank is offering, you can give them some literature such as pamphlets explaining your banks product. It will depend on your banks policy on giving out information to non-customers.
The information that you give the possible customer should include prices and any perks that they may receive for changing banks. In addition to giving the person literature, you can offer to explain your product in more details and the reasons why they should change banks.
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