I purchased an item from the Walmart website, it arrived with good timing, but the product doesn't work. The number that's provided goes straight to the answering service.Who can I contact to get a replacement or refund?

Bring it to them with a receipt

Good luck. Walmart has vendors in their website too. But take it to the store and they will tell you

Take it to any Walmart and they will refund you or exchange which ever as long as you have receipt

Just return it to the nearest Walmart and have your online receipt with you.