Staff members are not allowed to punish users on accusations. They're only allowed to punish if there's sufficient proof, a confession or if they saw it with their own eyes.
If you speak the truth, then Nigerian will be told how to treat these situations better next time. I'll also ensure your warning is removed, if you can give me your SteamID.
Of course, if Nigerian denies your story and you do not provide proof of it happening then nothing much can be done I'm afraid.
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