I’m terribly sorry to hear you had a less than desirable experience with our form builder. I was able to locate your support ticket, and it does not appear that we, or our responding support specialist ever blamed another plugin. Rather we enacted the first step within our scope of support (https://ninjaforms.com/scope-of-support/), which provides initial troubleshooting, and allows us to garner further information necessary to diagnose a potential conflict.
In reply, you opted for, and requested a refund; being within your refund period, our specialist obliged, fulfilling the request.
If you have any desire to use our builder again, we would be more than happy to resume assisting you at: ninjaforms.com/contact