I am an angry client!!

My banking app hasn't been working for the whole 3 weeks and every time I call they put me through to the other department which I have to repeat the same thing over and over again. I still have transactions that I need to do but they are sitting down literally staring and laughing behind the screens as I go through the struggles. My request was for them to update my personal information cause i cant log in anymore. I was a happy client but anymore and I think I want to cancel everything that I have with them cause they don't have sense of emergency for their loyal customers