How to cancel subscription after deleting account??

Here is the whole story, I registered an Pro trial account using "leexiangwei@qq.com", then I found I didn't need it that time, then I deleted that account. Several days ago an email from Prezi telling me I would be charged if I don't cancel the subscription, but I have deleted that account!!  Then I registered a new Pro account using same name "leexiangwei@qq.com" and cancelled the subscription..Does it work? Shall I be charged for the first account because I didn't cancel subscription of that one? Tomorrow is the judgement day!
Please help me and Thank you!