Amazon randomly charging my card

Can anyone help for some unknown reason amaZon have started charging my credit card randomly every 2 weeks when there is money being held in my balance. So I emailed showing them the emails they have sent me and my credit card statement. And there asking what the payments are for ??? If I knew that I wouldn’t need to ask them would I. Where can I find some info as to why they are charging me ?? TIA

This will be the authorization charge which is done to verify you card’s validity.

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