thanks for the info guys, here's the link that 'sexus' sent me (thanks):
http://ec.europa.eu/internal_market/...rgeback_en.pdf
if you scroll down a bit you can see when a chargeback is justified, and one of the reasons is:
"i did not received what I purchased" - I believe this is exactly the case, they charged him for the 20 domain names but they could not register them, so basically he paid for goods/product that he did not receive
cool, I don't think chargeback should be a problem