There's no reason to provide technical support because your product is garbage not even remotely worth using anyway. To anyone attempting use this product, Stop, return it immediately for a full refund. You're wasting your time and money. Even if this product is exactly what you wanted to be you are endorsing the worst sin known to man, bad customer service.
I like the term character assassination because it is meaningless in every way and is a phrase used by people who have finally realized that the court of public opinion has found them guilty. Why don't you just do what I know that you want to do, and remove all of the negative posts from your website. The idea that you entertain things that are against you is laughable. This is your website, You have complete control, why would you dare to entertain somebody who was against you, when you can remove them absolutely?
Guess what, you made a mistake and now is the time to own up to that mistake. If you do that now maybe one iota of your worthless company will be worth salvaging in some way. Probably not but hey you can try. Because frankly, it's going to go one of two ways. Either this is going to hurt your company as it grows larger, or your company is not actually going to grow larger and was always going to fail anyway. Either way, A tiny portion of the Internet will experience schadenfreude on a scale unparalleled.