To refund iCould storage payment

Dear Apple team,

This is Wai Lwin using MN512ZP/A iPh 7plus, Jet Black 256GB (Serial No. F2****FYK). I have downgraded my payment to free (5GB) from the current plan of S$3.98 a month yesterday as I am planning to delete my current used apple ID account which is ****, it has been banned a few months ago without any notice. So I will use the new ID for my account security not to happen that I don't receive any notice mail from you. May I know what is your refund procedure?

For any reply email, please send to my current email (****).

<Personal Information Edited by Host>

Regards,

Wai Lwin