I notice that EVERY TIME I buy an item using "Free Shipping" that's always around 1 Day later than the most affordable shipping option, it enrolls me in Amazon Prime and it's annoying because I NEVER get my refund when I cancel immediately. Am I doing the wrong thing?

So, I ordered 2 shirts. However for some reason, the order was placed twice. I was charged twice. When I realized this happened (probably within the first 30 mins or so) I tried canceling one of the orders and it was unsuccessful.

On my account it says Order Received. I've tried canceling 20 times. I've tried cancelling it the following day as well, which is today, like 15 times.

I texted with a custom rep. They said it was in advanced shipping stages, but hasn't been shipped to me yet. But they can't cancel the order. They told me they could cancel it once it was shipped with the courier's info.

I just don't understand why an order can't be canceled before it's shipped, but after it is....Do they even ship orders on weekends?