Wetlook World Forum

I thought I'd ask here.  I thinking of starting an e-commerce site for hosiery.  You may know that this is my main interest.  

Recently I had a case at my work with a client paying by credit card over the phone, but her accountant screwed up and reported this charge as "fraud".  Even with a copy of the signed (by the owner) invoice confirming delivery of goods, this case was lost.  That client is an honest person, she tried to contact the bank... but you know how banks are, they never returned her messages.  She is a good woman, so she'll settle this somehow anyway.  

I hear from some small stores that they get chargeback issues from time to time.  For example, a person buys $400 bikini and then just cancels the transaction.  Another store had a guy buy $300 jeans twice and cancel that transaction twice.  Legal theft?  Horrible!  

So I want to know, how do you prevent chargebacks?  When you are an online business, you can't physically see the credit card.  Please let me know if there are any cases here to protect yourself from this kind of stuff.  I've heard some people use "verified by Visa" system.

Jessica