Irate customer

My way life insurance are playing and messing with my bank account, I was shocked last month on the 15 when they debited R614 and I reversed it as no one informed me about it. It happened again on 14 October same amount and when I called was told my sister used my account and I must investigate. I called my sister and She didn't even understand that, and how can this be even possible. I have been charged by Absa when I do reversals, I emailed them and Absa and my money was reversed while Myway life are not even bothered. I am irate customer and would like to expose them of their wrong doing and I do not care attitude.