my credit card has had a charge of $49 applied with the reference EbayPlus Sydney.

my credit card has had a charge of $49 applied with the reference EbayPlus Sydney.  I didn't authorise this fee so how do I go about having this fee credited back to my credit card.

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If eBay plus has your credit card details - you had to give them those details.

 

Unless as Dave says - hacked - which I don't think happened.

 

You signed up.