This is why it's called "High Risk". With an electronic transaction of digital goods or services, there is no proof of delivery. Repeat purchases, email confirmations, IP Address tracking etc, are still not proof according to the biller. The burden is on the merchant to do everything.
It doesn't mean that you are out of luck though. You could try calling the customer and asking why he charged back. You could also threaten to get your lawyer involved if he doesn't pay his bill. On small purchases and chargebacks its probably just as easy to let it go, but for big purchases it is worth chasing.
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