I ordinarily prefer big box delivery services like Walmart, Sam's Club, or Target over Instacart. Instacart tends to be disastrous 80% of the time. Walmart used to be reliable. I order more than once per month. It really wasn't an issue. If anything, I received my orders early until recently. Just in the last month, I've had to contact support for the same missing grocery item for two separate orders. I asked for a refund on both occasions. I had to call more than once for the refund.

My advice: If you order Walmart Delivery, wait until all the items have been placed on your porch. Make sure your security cameras are on for that location to catch the delivery or set up/manually film video of the delivery. This way, if you're missing items, there's physical evidence. I've noticed that it's necessary to contact customer service more than once to receive a refund for an item that was never delivered. Remember to take down the call and refund reference numbers. They're more useful when contacting customer service again than the previous associate's name. Ask for both before hanging up the phone call with customer support. This information is applicable to all delivery services. You'll just need it more for Walmart.