Loan credited and debited within hours from my acc

I app**** for a loan a from wonga, as soon as the money was deposited in my account, within hours, it was debit again by wonga, on my profile it appears as if I still owe Wonga, my question is, what am I paying for and where is the money that you debited, please Wonga, sort your systems because I did not even get the chance to use the money