Here is the list of wells fargo customer service phone numbers when you suspect a fraud
Personal
ATM, Debit Card, or Checking Fraud :1-800-869-3557
Credit Card Fraud : 1-800-642-4720
Business
ATM, Debit Card, or Checking Fraud : 1-800-225-5935
Credit Card Fraud : 1-800-225-5935
Wells Fargo Online Fraud (Bill Pay, Online etc) : 1-866-867-5568
Phishing Email/Text : 1-866-867-5568 also you can forward emails to reportphish@wellsfargo.com
Suspicious Phone Call : 1-800-869-3557
Identity Theft : 1-800-869-3557
Hearing Impaired Customers can call : TDD/TTY: 1-800-877-4833
Visit – https://www.wellsfargo.com/privacy-security/fraud/report/