Unhappy Customer??

Been a customer for over decade my bank can’t solve or rather help with a simple unauthorise debit order that must go off my account instead i get transferred from one person to another and they lack s****s because nobody can assist even my Premier department how do i be assured that my money is safe with this kind of low level of knowledge on their personnel? One even told me to go to the branch what difference it’s gonna make because they will just put you on the line to speak to the same people that can’t help me now because of lack of knowledge. But they promote their brand under slogan “how can we help you” but they can’t practice what they preach? I’m very unhappy customer now??