Pathetic service and charges for policies that customer's don't have with them

I canceled my home and car insurance with old mutual on the 27th July 2023 where I received conformation of cancelation. On the 18th August 2023 they charged me R1900 for a debit order that should have never gone off from my account. My banking account is in access of this amount plus interest. I want to know why and for what was this payment scheduled to off from my account. I am so happy I moved my business and money to a different insurer that gives me better service, more for my money and better premiums. Not to talk about customer service. If could would cancel the funeral policies i have with them as well. That's how much I want to cut ties with them. They a relationship gone sour finish to the bone until you have nothing left.