I hold no opinions, but it has been confirmed that violations such as Abusive Chat are verified by a Blizzard representative before account actions are issued (source). Furthermore there have been many instances where proven toxic players are often called out by Blizzard representatives:
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The Overwatch TOrbrbrbrbBrbrbrBrBrBRBBRBRBRBRbRBRBRbRB incident
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False reporting claim actually a user banned for Abusive Chat
No, I have not, but I am one of the forum MVPs and I work hard to provide detailed responses and help players get to the right resources they need and I also have direct communication with many of Blizzard’s customer service representatives. However, I know have been reported many times falsely, but I have never come close to even a warning.