Customer service hours are determined by the store’s location. Most Walmart stores are open Monday through Saturday, but some stores may be open on Sunday. Check the store’s hours online to determine whether it is open or closed.
Walmart customer service closes anywhere from 8 PM to 10 PM EST. It doesn't matter if For stores that aren't open 24 hours, they tend to close their customer service desks at 8 PM. There are some Walmart stores that are open 24 hours and that usually close their desks at 10 PM.
Walmart stores that are open 24 hours are always available for people to shop in, but because there are only a few customers shopping during that time, they don't always have someone stand-by for customer service. So, keep this in mind. You can wait until the next morning, where they usually open at about 7 or 8 o'clock.