The corrected form 1099-MISC replaces the original one. The casino has rightly corrected the form and you do not need to contact them again.
As the corrected form shows 0 in box 7, you do not have to report it on your tax return. You do not have to report the original form 1099-MISC either (as it has been replaced by the corrected form). If you have already entered these forms, just delete them in TurboTax.
You just have to enter your form W-2G.
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