All you need to do, is re-donate the amount that was charged back. Once you are done, send in a ticket with the following information:
How much you re-donated
When you re-donated
The transaction number
The email address you used and/or the name on the paypal account you used
On the subject line put:
Attn Talis: Re-donated $ due to charge back
And categorize it as "Donation"