We have had a similar experience, spanning over several months, where even updating the application and giving instructions on how to test it didn't trigger any reaction (just the same repetitive mail: "Your app does not comply with Google Play rules ...").
When I mean "give instructions on how to test it" : we created a test subscription on our platform, sent instructions on how to register and see what our app is doing, and our logs showed that no one attempted to go to that test subscription.
We also asked ourselves if we were exchanging emails with a human or a robot, and couldn't reach a conclusion.
You can always fall back to MS Paint: https://ms-paint-i.de/