Amazon didnt charge me for removal order

Hello everyone,

As I mentioned in the title I requested for removal order and Amazon successfully completed that request. All of my products have been shipped successfully to the address which I gave to Amazon.

Furthermore, I had to request for a account closure, and I completely deleted my account from Amazon.

However, now I wonder, Amazon did not charge me for that removal order at all. It was 23 units, and it completed for free. I guess there’s been a mistake. If anyone know anything about that, can you guys enlighten me?