DOUBLE CHARGED BY FNB

I recently had a problem with my FNB cheque account that I had for over decades now, I had a debit order that was constantly going out of my account which I didn’t know, I was told it’s Telkom I then called them to query this and they confirmed it was them meaning someone opened a ********** account under me and they requested that I send them an affidavit stating that I have nothing to do with this account & my ID copy which I did, And the debit order kept coming into my account as they were changing the amounts. I had no choice but to open a new account as I was told several times by FNB that there is nothing they could do to stop the debit orders also. And the consultant that helped me at Carlswarld Branch told me I can’t close the old account due to the fact that the account had an overdraft which I don’t understand why they can’t transfer the overdraft to the new account now I’m being harassed cause the old account have charges of +-1113.00 which means FNB is charging me double for something that can be prevented.