Prezi Charged $57.6 Despite Canceling Within Free Trial Period

I canceled my Prezi subscription during the one-week free trial period, yet one week later $57.6 was withdrawn from my account. This clearly shows that my cancellation request was not processed properly. I never agreed to continue with a paid plan, and I specifically canceled on time to avoid being charged. This situation is very frustrating because it feels like my request was ignored, and now I am left dealing with an unauthorized charge. I demand the immediate refund of the $57.6 taken from my account and the full cancellation of my subscription. If this issue is not resolved quickly, I will have no choice but to take legal action to protect my consumer rights. I expect Prezi to act responsibly, return my money without delay, and ensure that cancellation requests are properly respected in the future.