In store Walmart customer service hours:
8am-10pm. Customer service hours could vary depending on specific Walmart store opening hours. Typically customer service desk opens when the store opens and closes one hour before store closes. However, customer service supervisor is available from store open until store close time.
Phone customer service hours:
7am-6pm via phone 1-800-WALMART or 1-800-925-6278
Walmart.com online customer service hours
Available 24/7/365 via http://help.walmart.com/app/ask
Walmart feedback customer service hours
Available 24/7/354 via https://corporate.walmart.com/contact-us/store-corporate-feedback