iCloud refund. I haven’t used all of my iCloud and it seem that I’m paying 0.99 for what?

Click on the link to read how to "Downgrade or cancel your iCloud storage plan" on an iOS device, a Mac, or a PC. --> https://support.apple.com/HT207594

Note there's a big difference between the levels so even if you're using 10 GB of a 50 GB subscription you still need it if the alternative is 5 GB.

JCamp6 Said:

"Why am I being charged 0.99 per month and my iCloud is not full?"

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Because you are paying for the service.