Account debuting

Good day, I made a can insurance quote with Discovery around August then when we were about to finalise it then I changed my mind to stick with my old Insure then I notifed Discovery then and then, I called then and sent an email saying that I'm no longer continuing with them. To my surprised the same months they have debited my account then I revised it and called then again but still it is not happening as they have debited my account yesterday again now I have bank chargers. So who is going to pay for those charges. I have sent an email to Mulisa Museri and Samkelo Madonsela