Error rate equal to 90%, hangs up, customer service incompetent

We used this plugin for our products for several years. It worked well for a while. After some time, it no longer worked to add products to the shopping cart. The button kept loading and loading and loading … customer service couldn’t solve the problem, but we managed to get the button to work with our hoster, at least temporarily. Recently, the configurator simply hangs during the design process, so that no configuration is possible for my customers. Orders have almost stopped coming in for weeks, or even months.
Customer service keeps blaming the problem on us, our website, other plugins, the server … But the problem is simply not being addressed – or cannot be solved.
There are also some errors in the conditional logic rules that make some settings impossible for me.
In the meantime, customer service has completely given up and is not working on my problem; I didn’t even get an answer when I asked how they would solve the problem.
I am very dissatisfied with this configurator plugin and have now switched to another one. With this one, you don’t pay a fixed amount, but a fee per order. That’s fine with me, even if it might end up being more expensive, as the configurator runs much more smoothly and the settings are much simpler.