If so why and what was it for?

I can honestly say i have only ever done 1 chargeback and that was for a content purchase that never materialized a few years ago.

Ordered a couple of hundred bucks worth of content from this company (they are no longer around) waited a week for a download link.. it never came so i charged back

Also, under what circumstances do you think a chargeback is warranted?

Regards,

Lee