I sent something to a buyer in February, 20 days later he tried to claim the money back off me. Eventually the case was resolved in my favour despite it taking a week to get my account back in to a positive balance. Now he has tried once again to claim off me, this time using a "charge back" claim. Now my account is negative again. How do I stop this man from continuing to make claims and affecting my account when his original claim was denied and I haven't had any business with him since.
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