Edgars interest and cancellation of insurance

Edgars is one company that is FRUSTRATING and IRRITATING. I have been a customer for years. I have been complaining and directing my queries since 2020. They keep on charging me the 17% interest keep on charging in spite of the promise that they will stop it. I have cancelled an insurance in March and the company has confirmed that it is cancelled but they still have it in my statements. I've sent emails to their complaints email with no response. I sent 2 in July, NO RESPONSE. Can this company please get their act together or stop managing because they are clearly not capable. Mpho