Why am I getting a service charge?

Good day, I'm writing to inquire about a recent service charge that has appeared on my account. Could you please explain the reason behind this charge? I've reviewed my transactions and I'm unable to discern what service this charge corresponds to. Could you provide me with more details on the nature of this fee and if there's anything I can do to avoid it in the future? I appreciate your assistance in clarifying this matter. Thank you.