I'm not happy anymore with the Rain Internet service provider, I'm too much confused on the way the just deduct money from my account before the due date

I'm not happy anymore with the Rain Internet service provider, I'm too much confused on the way the just deduct money from my account before the due date. I have partly paid aome money until my payment date. Now I'm calling to fix the issue, they don't call back. Please contact me to fix an error on my account. You've deducted the money twice now, I'm really confused about it.