How can I cancel my membership?

I paid for 'Creative cloud All Apps' on June 22.
It explained that if you cancel the payment within July 7, you don't have to pay a fee. But today I want to cancel it, so I have to pay 115,500 won to cancel it. I only used it for about a week after I made the payment, and it clearly stated that it was until July 7th. I had to use it for a while before, so I used it for a few days and canceled it. At that time, I was able to cancel it without paying a fee, but I don't know why I have to pay a fee this time. Please let me know how to cancel without paying a fee. It's only been a week since I actually used it, and it's so unfair to cancel it after paying 115,500 won. I wish you could help me.