100Tbh is the worst hosting provider that we experienced, we asked for an IP KVM on our VPS and since we got a kernel panic on this server. In one month we created 8 supports tickets ...and they didn't take care of the last one created about these issues. So since 2 weeks, our VPS is useless and there is no way for having a good support from their side.
the paiement is by 2checkout and it's not possible to open a new litigation on paypal website if you got a problem ...
if you're doing that, check your paypal account right now, the paiement is, by default, a recurring paiement and they get money without your aprroval.