@foundationstation wrote:
It never hurts to contact the buyer, they may not necessarily be out to swindle you...they just might not recognise a transaction on their credit card statement.
I have found that if you upload proof of postage / delivery and a explanatory note, it generally helps.

 

Thats a very good point, I have had one buyer repay me before when it happened, it was so long ago I can;t remember the details of it though.