Walmart MasterCard

Walmart MasterCard Customer Service  1-888-331-6133 To Activate Card 1-888-779-2977 Report Lost or Stolen Card 1-888-925-6218 TTY 1-877-763-0997 Hours of Operation  Monday-Saturday: 8am-10pm (EST) Sunday: 10am-9pm (EST) Mailing Address  Walmart Rewards Mastercard P.O....

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