Sorry to hear that you aren't happy with the plugin.
However, I am sorry, but we haven't heard of some issues mentioned above.
Here are my answers to the concerns you've expressed above.
ConvertPlus stops working regularly, it seems every time there is an update available.
=> This should not be happening! Could you please open a ticket at our support center, so that we can take a look and help? In fact, we'd love to see when this happens so that we can detect what's going wrong and help.
Site being hacked
=> It is true that there was a security update we released a couple of years ago, but, it was fixed as soon as we realized it, published a blog post, and informed all our customers through email. This had not affected any website as far as we know. Here is an article that will tell you more about it.
It puts you up with a lot of work
=> Convert Plus is built to be the simplest popup plugin for WordPress. We haven't heard users finding it that difficult. We do have detailed knowledge base articles that help users work with the plugin and also offer dedicated support when users need us. :)
You can get in touch with us anytime you come across an issue, have any questions or need help.
We also assure that in case we find there is an issue in our plugin and it cannot be fixed, we'll process a refund right away.