If you have not found a solution after viewing the "Frequently Asked Questions," please contact Minna Denryoku Customer Support by phone or through the inquiry form.
▼Minna Denryoku Customer Support
[Phone] 03-6277-5441 / 050-3196-4220 (10:00-18:00 *Excluding January 1st)
[Inquiry Form] https://portal.minden.co.jp/contact/guest