Dissatisfied customer

I have been a customer with Standard Bank for a long time. I recently opened up a MyMo account and to me it’s a savings account as I was told. Of late, my account has been going into a negative and when I make my purchases I ensure that there is enough money in my account. I have visited the branch regarding this and have spoken to the call center but they keep telling me that there’s nothing they can do. I would advise potential customers not to even try open a MyMo account with Standard Bank because all they are doing is to eat our money.