I Tunes

I have been charged by Apple.com /bill on my card each time I purchase using my card .

Yes, sure, every time you puchase you will be charge.

If you don't want to be charge, then don't purchase.

See the following Apple articles:

If you want to cancel a subscription from Apple

If you want to cancel a subscription from Apple - Apple Support

If the subscription that you want to cancel is not listed

If the subscription that you want to cancel is not listed – Apple Support (UK)

Request a refund for apps or content that you bought from Apple.

Request a refund for apps or content you've bought from Apple – Apple Support (UK)

If you have requested a refund, you must wait until Apple has approved. Then you will receive a message from Apple.

Refunds are not guaranteed. For more information, see the Terms & Conditions.

See also -> Identify legitimate emails from the App Store or iTunes Store

Identify legitimate emails from the App Store or iTunes Store - Apple Support

Hello ~ Take a look here:

Subscriptions and Billing - Official Apple Support

~Katana-San~