You aren't doing much in terms of brand ambassadorship for PIA by muck raking and bickering with a competitor. It's quite petty. The comment about PIA wasn't put forth by ProtonVPN. They clarified the discrepancy you raised and did so in a civil manner.

I wasn't that familiar with your company before today but I can tell you that I won't be a customer at any time in the future based on your comments.