How to file charge back with your credit card against eBay and win?
First there is an old method, you call your credit card company whenever, and say you did not authorize the charge, or whatever you going to say. This usually will result in your credit card company investigating the charge.
We need to understand why.
Because they already paid eBay, and now in order to reverse this payment they must investigate.
There is a better way, more sure thing of a way. When you call and say you did not authorize those charges and they immediately reverse/stop the payment. Timing is everything, because eBay is given money not immediately, and you have several days of opportunity to call your credit card company say you did not authorize the charges. I'm assuming 5 days, but no more than 5. In fact the faster you call the better.
Thus, watch your e-mail, eBay will e-mail you when they are about to charge you.
Have an online account with your credit card, and monitor activity. Once it pops up, call your credit card company, bam, I did not authorize those charges. Chances are they tell you ok, we revered those charges you've been credited back.
BUT, WRITE DOWN THOSE REFERENCE NUMBERS ALL THE TIME, SAVE THEM ON YOUR COMPUTER. AND THIS IS EVEN MORE IMPORTANT, CALL BACK TO YOUR CREDIT CARD COMPANY IN SEVERAL DAYS AND QUESTION IF THEY DID WHAT THEY PROMISED.