low standards

I am very DISGUSTED at the ***** manner in which standard bank unknowingly swindles it's customers. As a loyal customer who has been with standard bank for years and in possession of a cheque account for the last two years, I've never been so disappointed as i am now. I opted not to take overdraft for reasons only important to me. For months I've been having a problem with their delayed transaction notifications. I know I don't have an overdraft so when I check my balance using their cellphone app and it reflects a positive balance one would assume they still have money. To my surprise when I checked my statement I had a negative balance and I've been charged twice for an \honouring fee"which is foreign to me. I need Standard bank to explain this to me as I am now indebted to standard bank for an amount of R1200"