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.

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.

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

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