On the 30 April I got debited from my account

On the 30 April I got debited from my account. I called to find out what the amount was for as I had not signed up for anything with them. They couldn't assist instead they wanted to update my cellphone number from the incorrect one they had on their system. I went to their branch in gateway and the consultant told me that I will have to let the debit orders run for the duration of the investigation. I was also told that investigations take up to 8month. This is unacceptable as I did not sign for any contract and I feel the consultant Vuyiswa that did it was probably working with someone from Nedbank. How else will they get my banking details or set a debit order that I have not authorized. I need answers from Nedbank and old mutual. *****ulent activity rate at old mutual is very concerning and I want to sue them