Hi. Was charged a $42.90 "one time set up fee" on my onlinebill. Thought all was paid when phone/account set up when purchacing/setting up at Walmart?!
One-time charges and credits
Are you sure it was the setup fee you paid for at Walmart? If you have the paperwork you can verify that.
Usually, the setup fee is billed to your account when the next invoice is produced.