Auto & General stop debiting my account whenever you feel like it please

I'm so disappointed with Auto & General insurance, they keep debiting my account whenever they feel like it. My debit order agreement with them is the 20th of every month. When I called them this morning the consultant by the name Lebohang told me there is nothing they can do on their side, that I won't get my money back. I asked to speak to her supervisor, I was put on hold for more than 10 minutes and then told they are all busy. This is not the first time it's happening. Am I not supposed to have money in my account because everytime I have money Auto & General takes it? She tells me that I have been put on "early deductions". I never asked for that hence I have a debit order agreement with them. How am I supposed to get through the month now that you have taken my money Auto & General? I'm so so disappointed, this is extremely poor service.