My name is ________ (name) and I am a subscriber of your _________ (services) having customer ID __________ (mention customer/consumer ID number). I am writing this email to bring to your attention that recently, I made a payment to _________ (change plan/renew subscription/any other) but I accidentally made a payment of _______ (amount).
Therefore, I request you to refund the additional amount to the same account. I hope that you will accept my request and process my refund as soon as possible. If you have any questions regarding this matter, you can contact me at __________ (contact number).
_________ (Contact details)