Busuu Subscription Charge Remained After Cancellation

I accidentally subscribed to the Busuu language learning app and canceled my membership immediately afterward. Despite canceling the membership, I was still charged for one month of the subscription on my bill on September 21.

I am filing this complaint because I was charged even though I had already canceled my membership. I request that the charged amount be canceled and refunded to me. I can be contacted through the email address registered in your system at r**********@gmail.com.

I kindly request that this issue be resolved as soon as possible.