Unauthorised/unknown debit

I closed my account with Nedbank and after two days my account was debited with R59.99 from this EC Finance and i don't even know them,I tried calling them but can't get through.The bank charged me R90.00 and my account is overdrwawn and don't know who are this people and where did they get my banking details.Please stop *****ing our money and taking from the poor.Please pay back my nedbank acc with the R59.99 and R90.00 bank charges.I don't know you and i need a response before i take further steps.