Final answer:
The caller with an unrecognized charge from Zappos.com on their credit card should be directed to the Fraud Department, where specialists can assist with potential fraudulent transactions.
Step-by-step explanation:
If a caller states they do not recognize a charge from Zappos.com on their credit card, they should be transferred to the Fraud Department. This department specializes in investigating unauthorized transactions and can assist the caller in determining whether the charge is fraudulent. They can also guide the caller through the next steps, which may include disputing the charge and securing their account.