This is probably not a question that you will be able to resolve on Google. Your best course of action would be to visit the customer service desk or to contact Walmart directly via their Facebook or Twitter accounts. Walmart is unlikely to see your question here so you may not have any timely resolution.
Maybe you made an account with that email address and forgot about it so now you basically got a either reset password or make a new email account and make a new account completely
Idk bro i dont work there
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