Contract cancellation

My contract ended on the 22 of august 2025 I was paying 503 every month now that my contract ended on August now on September 2025 they have deducted R443 I don't know why they deducted this money I emailed them twice but they don't respond I also called the cancellation number but they are not helping today I also received an invoice for this month October for me to pay R443 I don't know why I have to pay while my contract ended on August Vodacom don't care about their customers and they don't even communicate with their customers