How to write a email to the apple ?if possible what is the mail address ?

I do not believe Apple has any public emails for the sake of writing in, I am assuming for a complaint?

If you want to write about a product or service, you would visit https://www.apple.com/contact/feedback.html

If you want to contact Apple about an issue you are having, depending on the product or service, they will have email, chat, or phone options on https://getsupport.apple.com/ (It won't give you an email address until you submit the case and get the email confirmation in your email).

Apple's contact page does provide a corporate address if you were looking to reach someone in there, but you may have to physically send a letter. http://www.apple.com/contact/

OK I understand you are having issues with your iCloud Storage Space showing you used 100 MB when you have only used 10MB. Usually iCloud space is measured in GB, with the free capacity being 5 GB. Here is how you can manage your storage: Managing your iCloud storage Hopefully that will help you find what is taking your iCloud space.

If not, you will need to contact apple. Contact Apple for support and service (Click on the flag circle icon for your region for more contact options).