Policy cancellation

I cancelled my policy on the 28 of February 2022 and yet you you still bill my account. I sent communication for my policy to be cancelled, as i was not getting joy with the services. As usual i was sent this message "Your request has been forwarded to the relevant department. They will be in contact within 24 working hours to further assist" but nothing from them till the 17 when they sent an email stating they have tried calling me. Why am i being billed for a policy that i have requested to be cancelled?