Autopage debited my account without permission

Autopage debited an amount of R800 from my account this morning without my permission. Apparently I have not paid my account since the migration from nashua mobile, I told them that I had a debit order with Nashua Mobile, I assumed that the debit order would continue. I was not told that I had to pay in. At first they said that debit order agreement was with Nashua not them and they didn't have my banking details. I asked for alternative payment methods because I would not be able to pay the lumpsum in one go. I asked for statements which had not been sent to me since January. I have not received those statements to date. They said a supervisor would call me to arrange for alternative payment methods, no one called me. I got an e-mail on Wednesday with a final notice before my bank account was debit with R800 this morning. The money that was in my account was not mine, I was supposed to book a flight for someone with it. Now it is gone, how am I going to explain to them that I cannot book their flight because autopage took it. They miraculously have my banking details now so I must pay for a mistake that they made. I am disgusted by the way they have handled this entire situation.<br>