Why has eBay taken funds from my bank without permission?

How can I complain directly to eBay to get funds back that they took from my bank? Does anyone have an email address I need to complain ASAP, I don't want this happening again and I want them to refund me! 

I had a refund from a seller, approx £12 but eBay took something called “recurrent transaction “ of £.3.25. Only a nominal amount but it’s the principle as I didn’t give them permission and the fact that that they call it ‘recurrent’ is a bit worrying. I am a buyer not a seller. They have taken part of the refund it seems but I don’t know why. Do you by any chance have a customer service email please?
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ebay cannot take money from your bank without permission,

 

 

what has actually happened?