Wonga - *****ulent amount loaded on my banking profile

In November I took out a loan with Wonga, the loan has been settled. I see now that they have loaded the loan amount back on my FNB account, When i finally got through to them on the phone they say the bank must take it off my name. The loan amount is also set to come off end of the month as per my profile. However I have settled it, the bank says its not on their side, I have then since tried to call and email Wonga and no one replies or answers the phone. This is also affecting my credit score and Wonga wont take any responsibility.