That's the crux of the problem. You are telling us that notice and notice is enough, but, on the one hand, you have no data, and, on the other hand, you are not able to tell me whether the 5% is representative or not. At Bell, you use envelopes to communicate with your clients.
Yet you insist that notice and notice is enough. I am not an engineer, but I would like to have data to rely on, and we don't.
Would you consider other systems that might have more teeth and address the whole bill? Or is this the only option for you?