If I'm correctly reading the comment you're replying to, it was against the law for WD to void the warranty. So, the warranty was not void.
> They stopped answering my emails/tickets.
It reads to me that the communication happened in an asynchronous channel. This doesn’t appear to have anything to do with a call center employee having a bad call experience.
To engage with your prior comment: sending such a claim in an email seems like a plausible way to get a company to at least think more about their practices. To your point, it would likely take a successful lawsuit to change their lawyers’ minds on this.