Big company ignoring emails from clients

On the 21st of July 2022 I sent an email to Absa Insurance requesting for the cancellation of my Absa Insurance policy. The email was sent to adminhoc at absa.co.za, after having mo reply to my request, I sent another followbup email on the 27th of July 2022 and no response has been received from ABSA to date. Instead Absa Insurance continued to debit my account regardless of my request to have the cover cancelled. The last day of cover should have been the 31st of July 2022, why were my emails ignored, two emails to be exact? Such a big company as ABSA shouldn't be ignoring emails fron clients. I need the Absa insurance policy cancelled and the amount that was debited on 1 August 2022brefunded urgently.