You sound like a very difficult customer who feels entitled. We have Prime but we never demand concessions from Amazon when packages are occasionally late. That's just lame.
Yeah, for me, it's a give and take relationship for sure. Although Prime is not cheap, I ship tons of packages each year myself, so I understand better than most how and why delays happen. I can't blame Amazon when it's more than clear USPS/FedX/UPS is at fault more often than not. I would say a good portion of my prime orders arrive late, but I only call them out on it when its a gift or something I really needed to be on time and it wasn't.
The same goes for damages, as 90% of my orders arrive with some defect, but contacting them about a box of band-aids arriving smashed is just being silly. I've honestly never considered being banned, although I have heard the warnings here weekly from others. As based on my overall purchases, I only contact them with issues for probably less than 1% of my orders. And even with those, it's even smaller than that, as I've only gotten stuff mostly from broken CS/Supervisor promises that didn't happen.
I did that prime extension thing 8 times last year due to late packages. Then again, I do buy a ton from them, so maybe that's why I'm not banned.
Your paying for a service, and if you don't feel it is being met on your end, you completely in your rights to contact them and state as much. If and when you may get banned, that is something you'll have to deal with as well. I honestly can't see a company promising "2 day" shipping, and then getting upset when it isn't delivered. If they don't want to hear from someone about it, don't promise it, PERIOD!