SHAME ON YOU STANDARD BANK

Standard bank debited my account with a large amount of money, for which I have not received a clear answer. I have phoned 3 times, each time holding for at least 30 minutes. Each time I phone, I get brushed off and get told that I need to speak to a supervisor. Then you hold again only to be told they are not available. you have to call back and the whole process starts again with no resolution. I have sent two emails to the correct email address and have not even received a acknowledgement of receipt or a ref number. I FIND THIS UNACCPETABLE that nobody is able to help with my rather desperate situation that I'm in. ANY HELP WOULD BE APPRECIATED AT THIS STAGE. As I'm writing this, I have been on hold for 29 minutes with no indication of when my call will be answered. SHAME ON YOU STANDARD BANK!!!!!!!